| Acronym | Meaning |
 | ASMB | American Society For Matrix Biology |
| OCI | Occitan Language (ISO 639-2 Code) |
| OC | Observer/Controller |
| FM | Federal Magistrate (Australian Post-nominal) -Federated States Of Micronesia (postal Symbol; ISO 3166 Digram; FIPS 10-4 Territory Code) -Field Manual - Flight Manager - Frequency Modulation (electronics) |
| PH | Parts Of Hydrogen (acidity/alkalinity Index) - Picohenry |
| LI | Lithium |
| CGDC | Computer Game Developers Conference (became GDC In 1998) |
| BALCO | Bay Area Laboratory Co-operative |
| PY | Paraguay (ISO 3166 Digram) - Person-Year -Portsmouth Yardstick |
| NARPV | National Association For Remotely Piloted Vehicles |
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