| Plasma Thromboplastin Antecedent | Academic & Science |
| Procrustes Target Analysis | Academic & Science |
| Practical Teaching Assignment | Academic & Science |
| Port Alsworth (ak) | Airport Code |
| Personal Time Away | Business |
| Preferential Trade Agreement | Business |
| Pennsylvania Treaty American Corporation | Business |
| Problem Tracking and Administration | Business |
| Preferential Trade Area | Business |
| Plenty of Tasks Ahead | Business |
| Public Transit Association | Business |
| Preferential Trade Arrangement | Business |
| Project Task and Awards | Business |
| Paper Trade Associates | Business |
| Purified Terephthalic Acid | Chemistry |
| Pupil Teacher Allowance | Community |
| Peoples Trade Alliance | Community |
| Parent teachers association | Community |
| Parents Teachers Association | Community |
| Parents and Teachers Association | Community |
| Precious Teacher Association | Community |
| Physical Therapy Assistant | Community |
| Parent Teacher Association | Community |
| Patch Trading Addiction | Community |
| Persistant Text Array | Computing |
| Parents Talk A-Lot | Computing |
| Pixel Tapestry Architecture | Computing |
| Ppp Termination Aggregation | Computing |
| Personal Telecommunications Assistant | Computing |
| Petrachor | Cryptocurrency |
| La Peseta | Cryptocurrency |
| Personal Time Alone | General |
| Power To Accept | General |
| Phytophthora taxon Agathis | General |
| Part Time Alcoholics | General |
| Pre Trial Agreement | General |
| Please Try Again | General |
| Takes Action | General |
| Pohakuloa Training Area | General |
| Pilotless Target Aircraft | General |
| Predicted Transmitting Ability | General |
| Partly Trained Apes | General |
| Packet Traffic Arbitration | General |
| Privileged Threat Analytics | General |
| Pretty Terrific Afternoon | General |
| Paranormal Teraindustriational Activators | General |
| Pizza Takeout Association | General |
| Parents Talking Alot | General |
| Promise To Attend | General |
| Papyrus Trans Am | General |
| Pretty Tired Already | General |
| Payable Through Account | General |
| Preferential Trading Area | General |
| Passenger Transportation Act | General |
| Public Transport Agency | General |
| Pontiac Trans Am | General |
| Part Throttle Acceleration | General |
| Paint Trim Assembly | General |
| Passenger Transport Authority | General |
| Provincial Towing Association | General |
| Pennsylvania Towing Association | General |
| Premium Transverse Architecture | General |
| Premium Technology Architecture | General |
| Pilipinas Taj Autogroup | General |
| Paralegal Transcendual Algorithms | Governmental |
| Prior To Arrival | Governmental |
| Public Transport Authority | Governmental |
| Particle Testing Authority | Governmental |
| Prevention of Terrorism Act | Governmental |
| Prepaid Ticket Advice | Governmental |
| Promiscuous TeenAger | Governmental |
| Preferential Treatment Accelerator | Governmental |
| Pain Torture And Agony | Governmental |
| PATIALA | Indian Railway Station |
| Partido de los Trabajadores de Andaluc? | International |
| Petite Tannante Aggressive | International |
| Partido de los Trabajadores de Andalucía | International |
| Partido Trabajador de Albania | International |
| Plataformas de Trabajadores Anticapitalistas | International |
| Protocolo de Transferencia de Archivos (File Transfer Protocol) | International |
| Push Them Away | Internet |
| Personal Travel Assistant | Jobs |
| Polynomial Time Algorithm | Maths |
| PeriTonsillar Abscess | Medical |
| Pre-Treatment Assessment | Medical |
| Post-Traumatic Amnesia | Medical |
| Posterior Tibial Artery | Medical |
| Physical Therapist Assistant | Medical |
| Persistent Truncus Arteriosus | Medical |
| Physical Therapist Assistants | Medical |
| Paranormal Transindustriational Activators | Medical |
| Percutaneous Transluminal Angioplasty | Medical |
| Pohakaloa Training Area | Military and Defence |
| Physical Terminal Address | Military and Defence |
| Prior To Admission | Military and Defence |
| Position, Time, Altitude | Military and Defence |
| Ppp (pont-to-point Protocol) Termination Aggregation | Networking |
| Pure Tone Average | Physics Related |
| Port Alsworth, Alaska USA | Regional |
| Post-test Analysis | Space Science |
| Potential Toxic Area | Space Science |
| Propulsion Test Article | Space Science |
| Penalty Time Averaged | Sports |
| Pre-transmission Audit | Telecommunication |
| Pakistan Telecommunication Authority | Telecommunication |