| Acronym | Meaning |
 | CCSK | Cyclic Code Shift Keying |
| BSW | British Standard Whitworth (screw Thread) |
| ACS | Affiliated Computer Services (NYSE ACS) - American Cancer Society - American Chemical Society - Association Of Caribbean States |
| IBO | Igbo Language (ISO 639-2 Code) |
| TTTEAF | Thomas The Tank Engine And Friends |
| PCZ | Panama Canal Zone (ISO 3166 Trigram; Obsolete 1980) |
| RISD | Rhode Island School Of Design (riz-dee) |
| REME | Royal Electrical And Mechanical Engineers |
| SECDEF | (U.S.) Secretary Of Defense |
| ZC | Zettacoulomb |
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