| Full Form | Category |
| acidity (pH) | Medical » British Medicine |
| Geoworks Optimized .goh include file | Computing » File Extensions |
| Hydrogen ion concentration | Medical » Laboratory |
| Hydrogen-Ion Concentration (Alkalinity) | Governmental » NASA |
| Pädagogische Hochschule | International » German |
| Pale Headed | Academic & Science » Universities |
| PantyHose | Miscellaneous » Clothing |
| Parallel Haskell | Business » AMEX Symbols |
| Parathyroid Hormone | Medical » British Medicine |
| Parker Hannifin Corporation | Business » NYSE Symbols |
| Past History | Medical » Oncology |
| Patch for HP | Computing » Software |
| Penthouse | Miscellaneous » USPS |
| Per Hire | Business » General Business |
| Percentage Hydrogen | Academic & Science » Physics |
| Perl Header | Computing » General Computing |
| Perl header file | Computing » File Extensions |
| Permanent Hiatus | Community » News & Media |
| phaeochromocytoma | Medical » British Medicine |
| PHase | Governmental » NASA |
| Phi Hanh | Miscellaneous » Unclassified |
| Philadelphia | Medical » British Medicine |
| Philadelphia Field Office | Governmental » FBI Files |
| Philippines | Regional » Countries |
| Phillips Head | Miscellaneous » Unclassified |
| phone | Academic & Science » Electronics |
| Phonetic spelling of word or name | Governmental » FBI Files |
| phosphate | Medical » British Medicine |
| Phrase-table (MS C/C++) | Computing » File Extensions |
| Phucking Huge | Miscellaneous » Unclassified |
| Physically Handicaped | Miscellaneous » Unclassified |
| Ping Hui | Miscellaneous » Unclassified |
| Place Hold | Community » News & Media |
| Place Holder | Miscellaneous » Unclassified |
| Plant Hygrophelia | Academic & Science » Botany |
| Platinum Hit | Miscellaneous » Unclassified |
| Players Handbook | Miscellaneous » Unclassified |
| Pleckstrin Homology | Medical » Laboratory |
| Pokemon Heart | Miscellaneous » Unclassified |
| Political Hypocrisy | Governmental » Politics |
| Polyphase | Governmental » Suppliers |
| Pondus Hydrogenii | Academic & Science » Chemistry |
| Porn Hub | Internet » Websites |
| Post-Hartshorne | Medical » Physiology |
| Potassium Hydrogen | Academic & Science » Chemistry |
| Potentia Hydrogenii | International » Latin |
| Potential Health | Medical » Physiology |
| Potential Heat | Miscellaneous » Unclassified |
| Potential Of Hardness | Miscellaneous » Unclassified |
| Power House | Business » Products |
| Power of Hydrogen | Academic & Science » Chemistry |
| Power of Hydrogen (hydrogen-ion concentration) | Medical » Oncology |
| Power of Hydronium | Miscellaneous » Unclassified |
| Prancing Horse | Sports |
| Precipitation Hardening | Miscellaneous » Unclassified |
| Presbyterian Hospital | Medical » Hospitals |
| Previous History | Medical » Prescription |
| Private Header | Computing » Networking |
| Probable Helium | Academic & Science » Chemistry |
| Process Homeostasis | Medical » Human Genome |
| Professional Hunter | Business » Occupation & Positions |
| Project Headquarters | Governmental » US Government |
| Proportional Hazard | Governmental » Military |
| Psychological Hypnosis | Academic & Science » Psychology |
| Pubic Hair | Community » News & Media |
| Public | Governmental » US Government |
| Public Health | Academic & Science » Chemistry |
| Public Holidays | Governmental » US Government |
| Public House | Community |
| Public Html | Computing » General Computing |
| Pulmonary Hypertension | Governmental » Military |
| Punishment House | Miscellaneous » Unclassified |
| Purple Heart | Governmental » Military |
| The Pulsed Heat | Miscellaneous » Unclassified |