| ZIHP | Zambia Integrated Health Programme |
| ZIHP | Zambia Integrated Health Project (USAID) |
| YouTube Symphony Orchestra | |
| YTSO | Yeni§ehlr Ticaret Ve Sanayi Odasi |
| ORHP | office of rural Health policy |
| ORHP | Old Republic Home Protection (San Ramon, California) |
| ORHP | Open Right Half Plane |
| ORHP | Oxfordshire Rural Housing Partnership (UK) |
| ZIH | Zentrum für Informationsdienste und Hochleistungsrechnen (German: Center for Information Services andHigh Performance Computing; various universities) |
| ZIH | Ixtapa/Zihuatanejo, Guerrero, Mexico - International (Airport Code) |
| PYT | Pretty Young Thing |
| PYT | Professional Yoga Therapist |
| PYT | Pull Yourself Together |
| PYT | Presbyterian Youth Triennium (religious organization) |
| PYT | Perth Youth Theatre (UK) |
| PYT | Preliminary Yield Trial |
| PYT | Pound Your Truck (PYT Offroaders Association Inc.) |
| PYT | People You Trust (party promotion) |
| PYT | Prove Yourself True (band) |
| PYT | Pennsylvania Youth Theater |
| PYT | Paid, Young, and Taking on the World from the Drivers Seat |
| SOR | schedule of order various locations |
| SOR | Sons of the Revolution |
| SOR | Society of Radiographers (trade associaton; various locations) |
| SOR | Sorry |
| SOR | Statement Of Reasons |
| SOR | Sex Offender Registry |
| SOR | System of Reference |
| SOR | Share of Revenue (finance) |
| SOR | Subscript Out of Range (computing) |
| SOR | Sorcerer (Dungeons and Dragons class) |
| SOR | Sexual Orientation Regulations (anti-discrimination) |
| SOR | Schedule of Requirements |
| SOR | Sphere of Replication |
| SOR | Stochastic Operations Research (Netherlands) |
| SOR | Statement of Remuneration (pensions; Canada) |
| SOR | Shire of Roebourne (Australia) |
| SOR | School of Rock (album) |
| SOR | Source Of Revenue |
| SOR | System of Records |
| SOR | Support of Optimal Routing |
| SOR | Syriac Orthodox Resources (Christianity) |
| SOR | Strength of Recommendation |
| SOR | Streets of Rage (game) |
| SOR | Study of Religion |
| SOR | Schedule of Rates (contracts) |
| SOR | Sound of Rails (band) |
| SOR | Sud Ouest Radiateurs (French: Southwest Tire) |
| SOR | Successive Overrelaxation |
| SOR | System of Record |
| SOR | Society of Rheology |
| SOR | Squadron Operations Room (various countries) |
| SOR | Starfire Optical Range (USAF) |
| SOR | Smart Order Router (Smart Trade) |
| SOR | Statement Of Requirement(s) |
| SOR | South of the River |
| SOR | Sale or Return |
| SOR | Some Odd Reason (band) |
| SOR | Safety Observation Report |
| SOR | Service Order Request (various companies) |
| SOR | State Of Readiness |
| SOR | Site Observation Report |
| SOR | School Organisation Review (UK) |
| SOR | Sold Out Rate |
| SOR | Steam-Oil Ratio (oil production measurement) |
| SOR | Residual Oil Saturation |
| SOR | Seal of Righteousness (gaming, world of warcraft) |
| SOR | Satisfait ou Remboursé (French: Satisfied or Reimbursed) |
| SOR | Static O-Ring (Lenexa, KS) |
| SOR | Statutory Orders and Regulations (Canada) |
| SOR | Source Of Repair |
| SOR | Synchrotron Orbital RadiatIon |
| SOR | Southern Ontario Railway |
| SOR | Statement of Responsibility (various organizations) |
| SOR | Specific Operational Requirement(s) |
| SOR | Stimulus-Organism-Response |
| SOR | Society of Robots (robot-building community) |
| SOR | Share of Responsibility |
| SOR | Strategic Oil Reserve |
| SOR | Start-Of-Run |
| SOR | Statement of Operational Requirements |
| SOR | Surface Overflow Rate |
| SOR | Start Of Record |
| SOR | Specification of Requirement (UK) |
| SOR | Stade Olympique Romorantinais (French soccer team; est. 1930) |
| SOR | Shadows of Reality (game) |
| SOR | Southern Oil Refineries (Wagga Wagga, Australia) |
| SOR | Sources of Reference |
| SOR | Share of Requirement (marketing) |
| SOR | South Orient (Railroad) |
| SOR | Stand-Off Radar |
| SOR | Stand Off Range |
| SOR | Stable Orbit Rendezvous |
| SOR | South of Range (installations and locations south of the Alaskan range; US Army) |
| SOR | Source of Receipt (finance) |
| SOR | Stock-Out Risk |
| SOR | Special Occurrence Report |
| SOR | Shipping Order Request |
| SOR | Student Owed Repayment |
| SOR | Standard Oxygen Required |
| SOR | severe off-road (vehicles/conditions) |
| SOR | Specific Orders and Requirements |
| SOR | Statement of Release (various organizations) |
| SOR | System for Optimized Recruitment |
| SOR | Staff of Recovery (gaming, MMORPG Ragnarok Online) |
| SOR | Service Object Request |
| RPH | Randolph (Amtrak station code; Randolph, VT) |
| RPH | Royal Park Hotel (various locations) |
| RPH | Royal Preston Hospital (Lancashire; UK) |
| RPH | Registered Pharmacist |
| RPH | Royal Perth Hospital (Western Australia) |
| RPH | Resource Priority Header |
| RPH | Regional Public Health (various locations) |
| RPH | Range per Hour (electric vehicles) |
| RPH | Radio for the Print Handicapped (Australia) |
| RPH | Revolutions Per Hour (printing speed) |
| RPH | Robert Packer Hospital (Sayre, PA) |
| RPH | Réseau pour la Psychanalyse à l'Hôpital (French: Hospital Psychoanalysis Network) |
| RPH | Reference Place Holder (index code) |
| RPH | Radio Pays d'Hérault (French radio station) |
| RPH | Rate Per Hour |
| RPH | Remember Pearl Harbor |
| RPH | Rocket Propelled Harpoon |
| RPH | Reference Process House |
| RPH | Revenue Per Hour |
| RPH | River Park Hospital (Huntington, WV and McMinnville, TN) |
| RPH | Réseau Potentiel Humain (French: Human Potential Network; EU) |
| RPH | Registered Professional Hygienists |
| ZI | Zone Industrielle (French business park) |
| ZI | Zug Island (band) |
| ZI | Zimbabwe |
| ZI | Zoom In |
| ZI | Aigle Azur (France, IATA airline code) |
| ZI | Zone of Interior |
| ZI | Zero Intercept |
| ZI | Zurich Insurance |
| ZI | Zonal Index |
| ZI | Zinc Institute (New York, New York) |
| ZI | Zelda Infinite (gaming) |
| HP | Hewlett-Packard |
| HP | Horsepower |
| HP | Home Page |
| HP | High Performance |
| HP | High Power(ed) |
| HP | High Point (geographical) |
| HP | Health Plan |
| HP | High-Profile |
| HP | Hidden Power (Pokemon) |
| HP | High Pressure |
| HP | High Pass (Filter) |
| HP | Harry Potter |
| HP | Higher Power |
| HP | High Production |
| HP | Head Phones |
| HP | Health Promotion |
| HP | Hire Purchase |
| HP | Hospital (UK) |
| HP | Headphone(s) |
| HP | High Priority |
| HP | Hand Phone (cellular phone) |
| HP | Human Performance |
| HP | Highway Patrol |
| HP | Health Points (video games) |
| HP | Hand-Painted |
| HP | Honda Prelude |
| HP | Health Physics |
| HP | High Purity |
| HP | Harp |
| HP | Heat Pipe |
| HP | High Priced |
| HP | Hyde Park |
| HP | House Party (Sims expansion pack) |
| HP | Historic Preservation (various locations) |
| HP | Hole Punch(er) |
| HP | Hand Picked (groundnuts) |
| HP | Hemel Hempstead (postcode, United Kingdom) |
| HP | Halbpension (German: halfboard) |
| HP | Himachal Pradesh (state in India) |
| HP | Heparin |
| HP | Hydrogen Peroxide |
| HP | Hypothalamic-Pituitary |
| HP | Hit by Pitch (baseball) |
| HP | Helicobacter Pylori (bacteria) |
| HP | Hôpitaux de Paris (French: Paris Hospitals; Paris, France) |
| HP | Honors Program (various schools) |
| HP | Hard Palate (mouth) |
| HP | Hemiparesis (medical disorder) |
| HP | Handicapped Parking (transportation) |
| HP | Half-Pint |
| HP | High Priest |
| HP | Houses of Parliament (UK) |
| HP | America West Airlines (airline code) |
| HP | Hunter Pence (baseball player) |
| HP | High Pitch (musical instruments) |
| HP | Helmerich & Payne (oil company) |
| HP | Huntington Park (California) |
| HP | Hot Process (soap making) |
| HP | Hip Pain |
| HP | Holding Pattern |
| HP | Hollowpoint (bullet) |
| HP | Horizontal Pitch (electronic equipment) |
| HP | Hello! Project |
| HP | Home Port (of a vessel) |
| HP | History and Physical (medical) |
| HP | Hotplugging (ability to plug in new devices and use immediately) |
| HP | Perigee Altitude (US NASA) |
| HP | Hypersensitivity Pneumonitis |
| HP | Health Practitioner |
| HP | Hunter's Point (San Francisco district) |
| HP | Holiday Pay |
| HP | Honey Pie (Beatles song) |
| HP | Hoi Polloi |
| HP | Hodrick-Prescott (Filter) |
| HP | Hersheypark (amusement park Hershey, Pennsylvania) |
| HP | Hole Plug |
| HP | Hydraulic Platform (self-propelled, fire brigade road vehicle for aerial rescue/firefighting used in UK) |
| HP | Health Post |
| HP | Hit Probability |
| HP | Health Physicist |
| HP | Human Pituitary Gonadotropin |
| HP | Hiroshima Prefecture |
| HP | Henry Paul (musician) |
| HP | Hurricane Program (US FEMA) |
| HP | Handyphone |
| HP | Horizontal Polarization |
| HP | Herald Press |
| HP | Heart Points (gaming) |
| HP | Hydrogen Purge |
| HP | Hot Pipe |
| HP | Heritage Party (Zambia) |
| HP | Hindustan Petroleum Corporation Ltd |
| HP | Hladno Pivo (band) |
| HP | Hope Page |
| HP | Head Prefect |
| HP | Harmonic Power |
| HP | Horse Piss (Horse Piss Beer) |
| HP | Hintapyyntö (Finnish) |
| HP | Hyper Police (anime series) |
| HP | Hale Pohaku (Dormitory at Mauna Kea Observatories) |
| HP | Half Position (music) |
| HP | Hit Point(s) (gaming) |
| HP | Higher Order Path |
| HP | Heptode |
| HP | Hemi-Pelvectomy (amputation) |
| HP | Hide Position |
| HP | Hajtás Pajtás (Bike Messenger Company; Hungary) |
| HP | Hazi Palinka (Hungarian plum brandy) |
| HP | Human Particulate |
| HP | Head Pixie (cartoon character) |
| HP | Household Profile |
| HP | Health Point(s) (gaming) |
| HP | Hypothication |
| HP | Hiper Pool |
| HP | Hora Prima (Latin: First Hour, epigraphy) |
| HP | Hic Positus (Latin: Buried Here, epigraphy) |
| HP | Honesta Puella (Latin: Virtuous Girl, epigraphy) |
| HP | Hereditatis Possessio (Latin: Ownership by Heritage, epigraphy) |
| HP | Horizontal Plotter |
| HP | Hydrographic Procedure |
| HP | Honestus Puer (Latin: Virtuous Boy, epigraphy) |
| YT | YouTube website |
| YT | Mayotte (ISO country code, top level domain) |
| YT | Yours Truly |
| YT | Whitey (white person) |
| YT | Yukon Territory (Canadian province; amusement park) |
| YT | Yorkshire Terrier |
| YT | Yoga Teacher |
| YT | You There? |
| YT | You Too |
| YT | Yellowtail (sportfish) |
| YT | YouThink.com |
| YT | Youth Theatre |
| YT | Harbor Tug (US Navy) |
| YT | Yung Tune |
| YT | Your Turn |
| YT | Youth Together |
| YT | Air Togo (IATA airline code) |
| YT | Yukon Time |
| YT | Young Telegraph (former children's supplement of UK newspaper) |
| YT | Young Threat (hip hop artist) |
| YT | Yard Tugboat |
| YT | Yes Trump (bridge) |
| SO | Significant Other |
| SO | Sistema Operativo (Italian: Operating System) |
| SO | Special Order |
| SO | Sign Off |
| SO | Second Order |
| SO | Sales Order |
| SO | Server Options |
| SO | Slip-On |
| SO | Service Order |
| SO | Standard Oil |
| SO | Sold Out |
| SO | Student Organization |
| SO | Safety Office |
| SO | Strike Out |
| SO | Standing Order |
| SO | Special Operations |
| SO | Southern Company (stock symbol) |
| SO | Security Officer |
| SO | Senior Officer |
| SO | Safety Officer |
| SO | System Operator |
| SO | Star Ocean (video game) |
| SO | Sims Online (game) |
| SO | Symphony Orchestra |
| SO | Staff Officer |
| SO | Special Olympics |
| SO | Somalia |
| SO | Shout Out (Internet slang) |
| SO | Sheriff's Office |
| SO | Small-Outline |
| SO | Stuck Open |
| SO | Stack Overflow |
| SO | Second Officer |
| SO | Sub-Optimal |
| SO | Shared Object (UNIX) |
| SO | Southampton (UK postal code) |
| SO | Strategic Objective |
| SO | Service Object |
| SO | Systems Operations |
| SO | System Owner (US NIST) |
| SO | Sistema Operacional (Brazil: Operating System) |
| SO | Shutout |
| SO | Serial Output |
| SO | Shaquille O'neal (NBA Player) |
| SO | Solothurn (Soleure; Suisse Canton) |
| SO | SharePoint Online (Microsoft Office) |
| SO | System Overload |
| SO | Strung Out (band) |
| SO | School's Out |
| SO | Sud-Ouest (French: south west) |
| SO | Siehe Oben (German: see above) |
| SO | Science Olympiad |
| SO | Station Officer |
| SO | Send Only |
| SO | Staff Officer (commissioned Police Officer attached to Inspector-General of Police) |
| SO | Shift-Out |
| SO | Spatial Orientation |
| SO | Southern Oscillation |
| SO | Socket Outlet (British, electrical) |
| SO | South/Southern |
| SO | Strategic Outsourcing (IBM) |
| SO | Sales Out |
| SO | Scottish Office |
| SO | Supply Officer |
| SO | Sud-Ovest (Italian: Southwest) |
| SO | Styrene Oxide |
| SO | Station Operator |
| SO | Shipment Order |
| SO | Supervisor's Office (USDA) |
| SO | Successful Offeror |
| SO | System Outage |
| SO | Superior Oblique (eye muscle) |
| SO | Seller's Option |
| SO | Sea Organization (Scientology) |
| SO | Switching Office |
| SO | Steward Observatory (University of Arizona) |
| SO | Specialist Operations |
| SO | Sensor Operator |
| SO | Southern Airways (airline) |
| SO | Special Orthogonal (mathematics; group theory) |
| SO | Safety Observer |
| SO | Solid Optical |
| SO | Slow Oxidative |
| SO | Sondrio, Lombardia (Italian province) |
| SO | Sans Opinion (French : No Preference) |
| SO | System Overheat |
| SO | Stewardship Ontario (Canada) |
| SO | Semantic Object |
| SO | Sector Outperform (investing) |
| SO | Service Observe |
| SO | Division Staff Officer |
| SO | Show of Oil (drilling reports) |
| SO | Surface Operator (MFD) |
| SO | Semi-Orthogonal |
| SO | Stockage Objective(s) |
| SO | Source of Orgasm |
| SO | Synchronous Oscillator |
| SO | Supporting Organization of ICANN |
| SO | Service Overseer (Jehovah's Witnesses) |
| SO | Schriftelijke Overhoring |
| SO | Solicitation Officer |
| SO | Saneringsonderzoek (Dutch: soil remediation research) |
| SO | Step Off Ministry |
| SO | Shipment/Shipping Order |
| SO | Seige Onager (Age of Kings game) |
| SO | Südost/Südosten (German: South-East) |
| Rh | Rhesus factor |
| Rh | Relative Humidity |
| Rh | Right Hand |
| Rh | Ressources Humaines (French: Human Resources) |
| Rh | Reproductive Health |
| Rh | Robin Hood (KIVA algorithm) |
| Rh | Recursos Humanos (Portuguese) |
| Rh | Red Hot |
| Rh | Research Highlights |
| Rh | Rural Health (various locations) |
| Rh | Radiation Hybrid |
| Rh | Right Heart (cardiology) |
| Rh | Redhat Linux |
| Rh | Redhill (postcode, United Kingdom) |
| Rh | Rhodium |
| Rh | Radiohead (band) |
| Rh | Rush Hour |
| Rh | Republika Hrvatska (Republic of Croatia) |
| Rh | Restaurant Hospitality |
| Rh | Red Herring (magazine) |
| Rh | Renkus-Heinz (audio equipment; Foothill Ranch, CA) |
| Rh | Rechnungshof (Austrian auditing authority) |
| Rh | Rose-Hulman (College) |
| Rh | Rohm and Haas |
| Rh | Relative Hazard (statistics) |
| Rh | Running Hour |
| Rh | Rochester Hills |
| Rh | Red High |
| Rh | Southern Rhodesia |
| Rh | Remote Handled |
| Rh | Robert Hooke (discovered the cell by zooming in on a slice of cork) |
| Rh | Radiation Hardened |
| Rh | Row Hit (computer engineering) |
| Rh | Real Heroes (band) |
| Rh | Reheater |
| Rh | Radiation Hazard |
| Rh | Rear Heater |
| Rh | Regional Head |
| Rh | Road Head |
| Rh | Road Hog |
| Rh | Registered Herbalist |
| Rh | Receding Horizon (optimization technique) |
| Rh | Ressources Halieutiques (French: Fisheries resources) |
| Rh | Rubeus Hagrid (Harry Potter) |
| Rh | Radar Homing |
| Rh | Reentry Home (US DoD) |
| Rh | Robert Huth |
| Rh | ROM Hacking |
| Rh | Raffles Hall |
| Rh | Reaction History |
| Rh | Riza Hawkeye (Lieutenant in anime Fullmetal Alchemist) |
| Rh | Rice Hispa |
| Rh | Registered Healer (International Natural Healers Association) |
| Rh | Radar Head |
| Rh | Rolf Holstensson (chair retailer; Bodaford, Sweden; est. 1977) |
| Rh | Refined Hydrocarbon |
| Rh | Reported in the House of Representatives (bill status) |
| Rh | Resnik House (Carnegie Mellon University) |
| Rh | US Revenue Cigarette Tubes (Scott Catalogue prefix; philately) |
| HP is repeated | HP is repeated |
| Acronym | Definition |
| P | PM (Post Meridian) |
| P | Park (automatic transmissions) |
| P | Parking |
| P | Pence |
| P | Page |
| P | Power Set (mathematics, set of all subsets) |
| P | Momentum (physics) |
| P | Program |
| P | Power |
| P | Porno |
| P | Partner |
| P | Port |
| P | Protection |
| P | Poor |
| P | Pressure |
| P | Path |
| P | Passed (that a bill was approved; US House) |
| P | Philadelphia, PA (mint mark) |
| P | Practical |
| P | Northern Ontario (postal code designation, Canada) |
| P | Para (benzene) |
| P | Polish (rabbit breed) |
| P | Piano (music) |
| P | Personnel |
| P | Parent Corporation (IRB) |
| P | Pilot |
| P | Provider (IETF RFC 2547) |
| P | Progressive Scan |
| P | Portugal (ISO Country Identifier) |
| P | Packed |
| P | Pole |
| P | Priority (precedence level) |
| P | Priority (logging abbreviation) |
| P | Proof (coin and stamp collecting) |
| P | Precision |
| P | Pentium (Intel processor) |
| P | Patrol (US military aircraft designation; as in P-2D) |
| P | Processor |
| P | Plug (electrical connector) |
| P | Punch |
| P | Pulse |
| P | Paragraph (HTML) |
| P | Promoted |
| P | Pause(d) |
| P | Pedigree (breeding and genetics) |
| P | Probability (Statistics, Probability theory) |
| P | Probable (player's likelihood of participating) |
| P | Pursuit (US military aircraft designation, 1925-1947; as in P-51) |
| P | Predicted |
| P | Pointer |
| P | Pitcher (baseball) |
| P | Phillips Petroleum (stock symbol) |
| P | Pegasus (as in PMail) |
| P | Points scored (hockey) |
| P | Posse |
| P | Punctuation |
| P | Pawn (Chess) |
| P | Personal issue (Stores 100 code) |
| P | Provisional |
| P | Problematic |
| P | Precedence |
| P | Partition function (mathematics; number theory) |
| P | Posterior |
| P | Parity |
| P | Proton |
| P | Perch |
| P | Pico- (10^-12, SI Prefix) |
| P | Phosphorus |
| P | Progeny (breeding and genetics) |
| P | Peta- (10^15) |
| P | Pesos |
| P | Proline (amino acid) |
| P | Poise |
| P | Peacekeeping |
| P | Propeller (aircraft type) |
| P | Pouce (French: inch) |
| P | Polynomial (Complexity Theory) |
| P | Permutation (probability) |
| P | Phon (unit of apparent loudness) |
| P | Punter (football) |
| P | Pesetas |
| P | Phosphore (French) |
| P | Phosphoprotein (virus protein) |
| P | Pyrazinamide |
| P | Probability of detection |
| P | Compressional (wave) |
| P | Pultrusion |
| P | Promotable |
| P | Primipara |
| P | Parental Generation (genetics) |
| P | Newspaper Stamp (Scott Catalogue prefix; philately) |
| P | Permeability Constant |
| P | P Sub-Shell (second subshell of an electron shell) |
| P | Onde Prime (Italian: second wave; seismography) |
| P | Phyomycetes (microbiology) |
| P | Primary Body Waves |
| P | Procedure-Required Tuned NAVAID (aviation) |
| P | (before officer title acronym) Past Officer |
| P | First Heartbeat Wave |
| P | US DoT tire speed rating (93 mph) |
| Z | Zulu |
| Z | Impedance |
| Z | GMT / UTC (logging abbreviation) |
| Z | Effort (US DoD) |
| Z | Zone |
| Z | Speed Rating (department of transportation maximum tire speed rating of 149+ MPH) |
| Z | Zero |
| Z | Zoloft (anti-depressant) |
| Z | All Stop (bell log on a US Navy ship) |
| Z | Zusammen |
| Z | Atomic Number (number of protons in nucleus) |
| Z | Zodiac |
| Z | Flash (logging abbreviation) |
| Z | Flash (Priority) |
| Z | Zenith |
| Z | Corporation (IRB) |
| Z | Zorro |
| Z | Zillion |
| Z | Azimuth |
| Z | Footlocker (stock symbol) |
| Z | Zentner (German 50kg) |
| Z | Set of Integers (math) |
| Z | Zulu Time |
| Z | Zetta- (prefix, 10^21 or sextillion) |
| Z | Certain Amino Acids (glutamic acid, glutamine or a substance that yields glutamic acid on hydrolysis) |
| Z | Zygorhynchus (bacterium) |
| Z | Proton Number (physics) |
| Z | Sales in Full (newspaper stock table abbreviation) |
| Z | Lighter-Than-Air Vehicle (US Military aircraft type designation) |
| Z | Zionism/Zionist |
| Z | Administrative Aircraft (US Navy) |
| Z | Redshift Factor (determines how fast a cosmic object is moving away from Earth) |
| Z | Ultra Heavy Nuclei |
| Z | Unit of Sleep |
| Z | Zylog, Incorporated |
| Z | Benzyloxycarbonyl Compound |
| Z | Zuckung - Contraction |
| Z | Animalian Sex Chromosome (such as chickens and moths) |
| Z | Jet Terminal Area |
| Z | Aircraft Symbol Prefix – Planning |
| Z | Center of an algebraic group (mathematics) |
| Z | Depth axis in Cartesian coordinate system |
| Z | Discrete-time complex variable (analogous to S in continuous-time; electrical engineering) |
| PH | Telephone |
| PH | Philippines (Internet top level domain) |
| PH | Public House |
| PH | Potential of Hydrogen - negative 10-base log (power) of the positive hydrogen ion concentration; measure of acidity |
| PH | Public Health |
| PH | Human Performance |
| PH | Phase |
| PH | Physical (layer, ISDN) |
| PH | Population Health |
| PH | Penthouse |
| PH | Please Help |
| PH | Pantyhose |
| PH | Photograph |
| PH | Paris Hilton |
| PH | Pearl Harbor |
| PH | Perth (postcode, United Kingdom) |
| PH | Personal Hygiene |
| PH | Pulmonary Hypertension |
| PH | Public Holiday |
| PH | Perpetual Help (Catholic schools) |
| PH | Philadelphia Chromosome (molecular biology) |
| PH | Purple Heart |
| PH | People Here (chat) |
| PH | Parliament House (various locations) |
| PH | Phosphates |
| PH | Pizza Hut |
| PH | Pennsylvania Hospital |
| PH | Phenyl |
| PH | Photocopy |
| PH | Phot (unit of illumination) |
| PH | Port Harcourt |
| PH | Pranic Healing |
| PH | Pandora Hearts (anime) |
| PH | Pädagogische Hochschule (German: University on Education) |
| PH | Physically Handicapped |
| PH | Pin Hole |
| PH | Parathyroid Hormone |
| PH | pubic hair |
| PH | Pulmonary Hemorrhage |
| PH | Providence Hospital |
| PH | Pleckstrin Homology |
| PH | Precipitation Hardening (steel) |
| PH | Place Holder (gaming) |
| PH | Professional Hunter |
| PH | Phantom Hourglass (Zelda game) |
| PH | Policyholder (insurance) |
| PH | Parker Hannifin Corporation |
| PH | Past Medical History |
| PH | Potato Head (toy) |
| PH | Potencial Hidrógeno (Spanish: Potential Hydrogen) |
| PH | Peak Hour |
| PH | Proportional Hazard(s) |
| PH | Purpura Hemorrhagica (horses) |
| PH | Partial Hepatectomy |
| PH | Phillips Head (screwdriver) |
| PH | Peace Health |
| PH | Partido Humanista (Portugese: Humanist Party) |
| PH | phenylalanine hydroxylase |
| PH | Paid Holiday |
| PH | Pilot House |
| PH | Portola Hills (California) |
| PH | Packet Header |
| PH | Porter Hall |
| PH | Player's Handbook (Dungeons & Dragons) |
| PH | Pharmacie Hospitalière (French: Hospital Pharmacy) |
| PH | Pablo Honey (Radiohead album) |
| PH | Pyramid Head (Silent Hill video game/movie) |
| PH | Personal Holiday |
| PH | Package Handler |
| PH | Pondus Hydrogenii (Latin: Hydrogen Weight) |
| PH | Personal Historian |
| PH | Phase Type Distribution (probability concept) |
| PH | Protocol Handlers |
| PH | Packet Handler |
| PH | Path History |
| PH | Paul Heyman (former WWE Smackdown GM) |
| PH | Potentia Hydrogenii (Latin: hydrogen power) |
| PH | Poo Head |
| PH | Product Hierarchy |
| PH | Probability of Hit |
| PH | Prahova County (Romania) |
| PH | Pinch Harmonic (Guitar sound made by pinching the strings with the pick) |
| PH | Pizza Haven (Seattle, WA; est. 1958) |
| PH | Pillowhead (gaming clan) |
| PH | Parity High |
| PH | Premium History (insurance) |
| PH | Presentation Header (TMN) |
| PH | Plataforma Humanista |
| PH | Physical Header |
| PH | Primal Heuristic (algorithm) |
| PH | Porphyric Hemophilia (disease) |
| PH | Phalasteen.com (website) |
| PH | Puissance de Hydrogen (French: power of hydrogen) |
| PH | Protection and Handset |
| PH | Poké Hunters (webcomic) |
| PH | (USN Rating) Photographer's Mate |
| RO | Romania |
| RO | Radio |
| RO | Removal of (medical) |
| RO | Run on (proofreading) |
| RO | Reverse Osmosis |
| RO | Right On |
| RO | Ride-On (Montgomery County, Maryland transit provider) |
| RO | Ragnarok Online (computer game) |
| RO | Royal Oak (Michigan City, MI, USA) |
| RO | Read Only |
| RO | Regional Office |
| RO | Rule Out |
| RO | Rollover (financial) |
| RO | Rovigo (Italy) |
| RO | Readout |
| RO | Reorder (proofreading) |
| RO | Rondônia (Brazilian state) |
| RO | Restraining Order |
| RO | Reliability of Operations |
| RO | Reverse Order |
| RO | Remains Open |
| RO | Radio Operator |
| RO | Red Orchestra (computer game) |
| RO | Registered Owner |
| RO | Reserve Officer |
| RO | Record Only |
| RO | Revenue Officer |
| RO | Responsible Officer |
| RO | Research Only |
| RO | Research Objective |
| RO | Rough Opening (construction) |
| RO | Room Only (hotel) |
| RO | Rock Opera |
| RO | Renewables Obligation (UK) |
| RO | Repair Order |
| RO | Ruimtelijke Ordening (Dutch: spatial development) |
| RO | Risk Officer |
| RO | Russian Orthodox |
| RO | Radiation Oncologist |
| RO | Robust Optimization |
| RO | Required One-Time |
| RO | Ranking Officer |
| RO | Receptor Occupancy (pharmacology) |
| RO | Routine Order (Canadian Military) |
| RO | Reporting Officer |
| RO | RingOut |
| RO | Retired Officer (UK) |
| RO | Remote Operations |
| RO | Rescue Officer |
| RO | Remote Office |
| RO | Tarom Romanian Air Transport (IATA airline code) |
| RO | Recherche Opérationnelle (French: Operations Research) |
| RO | Radar Operator |
| RO | Recognized Organization (various countries) |
| RO | Registration Officer |
| RO | Receive Only |
| RO | Request Order |
| RO | Reactor Operator |
| RO | Requested Off (work schedule) |
| RO | Royal Observatory |
| RO | Regnum Online (video game) |
| RO | Revenue Outturn (UK) |
| RO | Restriction Orifice (device used to drop pressure in a pipe) |
| RO | Resident Office |
| RO | Reviewing Official |
| RO | Requirements Officer |
| RO | Residence Order |
| RO | Raphe Obscurus |
| RO | Range Only (sonobuoy, AN/SSQ-47) |
| RO | Route Order |
| RO | Régime Obligatoire (French: Required Plan; health care) |
| RO | Relay Operator |
| RO | Rate Offset |
| RO | Right Outboard |
| RO | Requirements Objective |
| RO | Requisitioning Objective |
| RO | Radiological Officer |
| RO | Regional Operation (various organizations) |
| RO | Rotate Out (Hyper Logo Turtle Graphics command) |
| RO | Redistribution Order |
| RO | Rutas Orientales (Spanish: Eastern Routes) |
| RO | Routing Office (US Navy) |
| RO | Regrets Only (invitation response) |
| RO | Réponse Objective (French) |
| RO | Registered Optician |
| RO | Reportable Occurrence |
| RO | Resistive Open |
| RO | Routing Organisation |
| RO | Report Orderly |
| RO | US Revenue Private Die Proprietary (Scott Catalogue prefix; philately) |
| ST | Street |
| ST | State |
| ST | Saint |
| ST | Star Trek |
| ST | Stanza |
| ST | Statement (Spender Audio Systems, Ltd.) |
| ST | Short-Time |
| ST | Start |
| ST | Spring Training (baseball) |
| ST | Subject to (math) |
| ST | Special Training |
| ST | Science And Technology |
| ST | Short-Term |
| ST | Standard Time |
| ST | Sunday Times (newspaper; various locations) |
| ST | Stores (on-line ordering and catalog system) |
| ST | Systems Technology |
| ST | Student/Teacher |
| ST | Stone (British weight;14 pounds) |
| ST | Space Technology |
| ST | Store (IBM) |
| ST | Sound Track |
| ST | Self Test |
| ST | Service Tax (India) |
| ST | Singapore Technologies (technology-based multinational conglomerate) |
| ST | Sales Tax |
| ST | Software Test |
| ST | Seattle Times (newspaper) |
| ST | Strength |
| ST | Stream (Experimental Protocol - Rfc1190) |
| ST | Straight Time |
| ST | Split (Split and Dalmatia county, Croatia) |
| ST | Saint Lucia |
| ST | Sao Tome and Principe (top level domain) |
| ST | Short Tour |
| ST | Special Tools |
| ST | Source Text |
| ST | Service Test |
| ST | Stereo (sound) |
| ST | Straight Talk (Uganda newspaper) |
| ST | System Test |
| ST | Star Tours |
| ST | Semi Trailer |
| ST | Scientific/Technical |
| ST | Strain |
| ST | Shirley Temple (cocktail) |
| ST | Share Time (broadcasting operating schedule) |
| ST | Sport Touring (motorcycle and riding style) |
| ST | Surface Temperature |
| ST | Stoke On Trent (postcode, United Kingdom) |
| ST | Scottish Terrier |
| ST | Stratus (cloud formation) |
| ST | Story Teller (Larp and White Wolf Games) |
| ST | Stokes (kinematic viscosity) |
| ST | Samantha Thavasa (store; New York) |
| ST | Shania Twain (country music artist) |
| ST | Sexual Tension |
| ST | Spinal Tap (band) |
| ST | Strike Team |
| ST | Straits Times (Singapore newspaper) |
| ST | Such That (mathematics) |
| ST | Space Telescope |
| ST | Scar Tissue (Red Hot Chili Peppers song) |
| ST | Scheduled Tribes (India) |
| ST | Seal Team |
| ST | Special Test |
| ST | Skip Tracing |
| ST | Security Target (IT security, informatics) |
| ST | Sino-Tibetan |
| ST | Skin Temperature |
| ST | Super Turbo (Street Fighter: Super Turbo game) |
| ST | Spirit Tracks (gaming) |
| ST | Suicidal Tendencies (band) |
| ST | Starship Troopers |
| ST | Sports Technologies (Collinsville, CT) |
| ST | Stumped |
| ST | State Transport (India) |
| ST | Steam Turbine |
| ST | Self-Titled (also seen as S/T) |
| ST | Single Throw |
| ST | Supertramp (band) |
| ST | Sound Transit (Seattle, WA) |
| ST | Sarjana Teknik (Indonesian: Bachelor of Engineering) |
| ST | Shark Tale (movie) |
| ST | Seagate Technology LLC |
| ST | Smokeless Tobacco |
| ST | Senior Technician |
| ST | Signing Time (tutorials) |
| ST | Sulfamethoxazole-Trimethoprim |
| ST | Streets and Trips (Microsoft) |
| ST | Symbol Time (algorithm) |
| ST | Star Tracker |
| ST | Sex Therapist |
| ST | Special Tactics |
| ST | Sundsvalls Tidning (Swedish newspaper) |
| ST | Short Ton |
| ST | Supertones (band) |
| ST | Spherical Trigonometry |
| ST | Slow Twitch (muscle fiber type) |
| ST | SuperTux (game) |
| ST | Standby Time |
| ST | Sebastian Telfair (NBA Player) |
| ST | Special Text |
| ST | Spasmodic Torticollis |
| ST | Saving Tackle (soccer; a stopping of an unopposed opponent with the ball) |
| ST | Satellite Transmission |
| ST | Sinus Tachycardia |
| ST | Sindh Today (internet newspaper) |
| ST | Sonic Team (game developers) |
| ST | Sakura Taisen |
| ST | Straight Tip (AT&T fiber optic connector) |
| ST | Sequential Timer (electronics) |
| ST | Structured Text |
| ST | Sacrotuberous (ligaments) |
| ST | Secondary Target |
| ST | Senior Trooper |
| ST | Slovenske Telekomunikacie (Slovak: Slovak Telecom) |
| ST | STMicroelectronics, Inc. |
| ST | Special Tooling |
| ST | Segment Type |
| ST | Simulation Testing |
| ST | Spherical Torus |
| ST | Sunken Temple (World of Warcraft game) |
| ST | Sagittal Translation |
| ST | Short Transverse |
| ST | Sexy Thang |
| ST | Self Timed |
| ST | Saint Tail (anime) |
| ST | Strangetown (Neighborhood in the Sims 2 computer game) |
| ST | Send Timing |
| ST | Spherical Tokamak |
| ST | Start Transmission |
| ST | Stratosphere-Troposphere |
| ST | Sonar Technician |
| ST | Stable Toxin |
| ST | Soul Theory (Buddhism) |
| ST | Subscriber Terminal |
| ST | Surveillance Test |
| ST | Sine Tempore (Latin: date will start on time) |
| ST | Sunni Tehreek (religious movement in Pakistan) |
| ST | Sensitech, Inc |
| ST | Statistical Tolerance |
| ST | Super Tunnel (a burrowing protocol) |
| ST | Sixteen Thirty-Two (Atari computers) |
| ST | Student Text Book |
| ST | Stop Tone |
| ST | Strukturierter Text (German: Structured Text) |
| ST | Showturtle (Hyper Logo Turtle graphics command) |
| ST | Synthesis Telescope |
| ST | Strategic Testing |
| ST | Signaling Tone |
| ST | Stick and Turn (fiber optic cable connector) |
| ST | Steam Traced |
| ST | Standing Tank (gaming, Battleclash tank configuration) |
| ST | Springfield Terminal Railway Company |
| ST | Static Topology |
| ST | Sleeve Target |
| ST | Short-range Transmitter |
| ST | Skull Tag (gaming) |
| ST | Signaling Terminal |
| ST | Sector Tandem |
| ST | Snap and Twist (fiber optics cable connector) |
| ST | Subacute Sclerosing Pan-Encephalitis |
| ST | Missionary Servants of Most Holy Trinity (religious order) |
| ST | Speech Therapy/Therapist |
| ST | Spiral to Tangent |
| ST | Sinustachycardia (cardiology) |
| ST | Systems and Technology Directorate (NIMA) |
| ST | SurgicTube (website) |
| ST | Singly-Testable |
| ST | Stripper Thresher |
| ST | (USN Rating) Sonar Technician |
| ST | Supply Tech/Technician |
| ST | Ship/Scan Type |
| YP | Yellow Pages |
| YP | Young Professional |
| YP | Your Problem (John Cleese) |
| YP | Young Person |
| YP | Yorkshire Post |
| YP | Yorke Peninsula (South Australia) |
| YP | Yield Point (PSI) |
| YP | Yard Patrol |
| YP | Yucatan Peninsula |
| YP | Patrol Craft (Self-Propelled) |
| YP | District Patrol Vessel (US Navy) |
| YP | Aero Lloyd Flugreisen (Germany, IATA airline code) |
| YP | Yukon Party (Canada) |
| YP | Years Purchase |
| YP | Yuri-Prime (Westwood Studios) |
| HI | Hawaii (US postal abbreviation) |
| HI | Holiday Inn |
| HI | Health Insurance |
| HI | Hindi (linguistics) |
| HI | Home Improvement |
| HI | Handicap International |
| HI | Head Injury |
| HI | High Intensity (carbon) |
| HI | Health International |
| HI | Hydraulic Institute |
| HI | HelpAge International |
| HI | Hostelling International |
| HI | Harris Interactive |
| HI | Hospital Insurance |
| HI | Humanitarian Intervention |
| HI | Health Informatics (various organizations) |
| HI | High Impedance |
| HI | Heart Institute |
| HI | Human Impact (index) |
| HI | Hearing Impairment |
| HI | Haemophilus Influenzae (bacteria) |
| HI | Harvest Index |
| HI | Heifer International |
| HI | Hardware Item |
| HI | Human Interactions |
| HI | Hemagglutination Inhibition |
| HI | Hostile Intent (gaming, Half-Life Modification) |
| HI | Heartland Institute (Chicago, IL) |
| HI | Hudson Institute |
| HI | Hydrogen Index |
| HI | Heat Insulated |
| HI | Head Guard (lifeguarding) |
| HI | Hasbro Interactive |
| HI | Hazard Index |
| HI | Hurley International (clothing company) |
| HI | Horizontal Integration |
| HI | Historiographical Institute (University of Tokyo; Japan) |
| HI | Heritage India (festival) |
| HI | Humorous Interpretation |
| HI | Hydriodic Acid |
| HI | Household International, Inc. (stock symbol) |
| HI | Heliospheric Imager |
| HI | High Inquisitor (Robert Jordan's Wheel of Time) |
| HI | Homicidal Ideation |
| HI | Height Indicator |
| HI | Hearing International |
| HI | Hospital Income (health insurance) |
| HI | Height of Instrument (surveying) |
| HI | Hochspannungsinstitut (German: High Voltage Institute) |
| HI | Harmony Incorporated (International Organization of Women's Barbershop Singers) |
| HI | Horizontal Indicator (aviation) |
| HI | Handover Initiation |
| HI | Heavy Inspection |
| HI | Herramientas Industriales (Spanish: hardware industry) |
| HI | Headington Institute (Pasadena, CA) |
| HI | Hertzian Indentation |
| HI | Hazelwood Initiative, Inc. (Pittsburgh, PA) |
| HI | Hollingshead International |
| HI | Hovedstadens Jernbane-Idræt |
| HI | Horizontal Inverval |
| HI | Hochschulverband für Informationswissenschaft eV |
| HI | High Nuc in Backhaul Check (airfare construction) |
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