| Acronym | Meaning |
 | CTC | Closed Timelike Curve (relativity) - (U.S.) Combat Training Center |
| RRS | Racing Rules Of Sailing |
| NTZ | Iraq-Saudi Arabia Neutral Zone (ISO 3166 Trigram; Obsolete 1993) |
| FM | Femtometre |
| CLI | Command Line Interface/Interpreter |
| HCSC | Higher Command And Staff Course |
| GC | East Germany (NATO Country Code; Obsolete 1990) -General Counsel -Gigacoulomb |
| CREB | Cyclic AMP-response Element Binding (protein) |
| RORO OR RO | Ro -Roll-On/Roll-Off (ferry) |
| ZI | Zimbabwe (FIPS 10-4 Country Code) |
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