| Abbreviation | Definition |
|---|---|
| PHLA | Post-Heparin Lipolytic Activity |
| PHM | Probe Heater Motor Controller |
| PHN | Pharyngeal Branch Of The Vagus Nerve |
| PHN | Phrenic Nerve |
| PHO | Photography |
| PHOTONS | Photometric Thermospheric Oxygen Nightglow Study |
| PHP | Payload Handling Panel |
| PHR | Professional in Human Resources Certification |
| PHR | Preliminary Hazard Review |
| PHR | Payload Hazardous Report |
| PHS | Payload Handling Station |
| PHSF | Payload Hazardous Servicing Facility |
| PHT | Precipitation Heat Treated |
| PHWA | Psychologically Healthy Workplace Award |
| PHY | Physical Layer |
| PHY | Physician |
| PI | Processing Instruction |
| PI | Pages In |
| PI | Physician Investigator |
| PI | Property Inspector |
| PI | Principle Investigator |
| PI | Primary Investigator |
| PI | Private Investigator |
| PI | Problem Investigator |
| PI | Position Independent |
| PI | Program Integrator |
| PI | Paranormal Investigator |
| PI | Political Informant |
| PI | Pool Instructor |
| PI | Principal Investigator |
| PI | Program Introduction |
| PI | Procurement Item |
| PI | Preliminary Investigation |
| PI | Payload Interrogator |
| PIA | Pakistan International Airlines |
| PIA | Project Initiation Agreement |
| PIA | Project Impact Analysis |
| PIA | Preinstallation Acceptance |
| PIAR | Project Impact Analysis Report |
| PIB | Press Information Bureau |
| PIB | Pyrotechnic Installation Building |
| PIBM | Planetary Interchange Of Bioactive Material |
| PIC | Punch Invalid Character |
| PIC | Programmable Interrupt Controller |
| PIC | Professional Interest Committee |
| PIC | Personal Information Connection |
| PIC | Pictorial Inventory Of Careers |
| PIC | Pharmacist In Charge |
| PIC | Pyrotechnic Initiator Controller |
| PIC | Pyro Initiator Capacitor |