| Acronym | Meaning |
 | RF | Radio Frequency - Receptive Field (neurophysiology) |
| IMPAC | International Merchant Purchase Authorization Card |
| RPS | Revolutions Per Second |
| OSI | Office Of Strategic Influence - Ontario Swine Improvement - Open Source Initiative - Open Systems Interconnection |
| AFRTS | Armed Forces Radio And Television Service |
| AET | After Extra Time (Football) |
| SM | Sado-Masochism -San Marino (ISO 3166 And FIPS 10-4 Country Code Digram) -Soldier's Manual -Submarine Minelayer (US Navy Hull Classification) |
| AAA | Administration |
| ATGM | Anti-Tank Guided Missile |
| MF | Millifarad |
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