| Acronym | Meaning |
 | TA | Tantalum |
| OR | Operating Room (surgery) - Operational/Operations Research -Oregon (postal Symbol) |
| SW | South-West - Sweden (FIPS 10-4 Country Code) |
| P2P | Peer-to-peer (networking) |
| PJ | Picojoule |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| GMT | Giant Magellan Telescope - Greenwich Mean Time |
| PGD | Pre-implantation Genetic Diagnosis |
| MAF | Maintenance Action Form |
| DCAS | Devon And Cornwall Archery Society |
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