| Acronym | Meaning |
| CTC | Closed Timelike Curve (relativity) - (U.S.) Combat Training Center |
| LB | Lebanon (ISO 3166 Digram) |
| NAV | Navajo Language (ISO 639-2 Code) |
| SCOTUS | Supreme Court Of The United States |
| ABL | American Basketball League |
| LI | Fifty-one (in Roman Numerals) -Liberia (FIPS 10-4 Country Code) - Liechtenstein (ISO 3166 Digram) |
| CSL | U.K. Central Science Laboratory |
| IO | Ido Language (ISO 639-1 Code) |
| Y | Yocto |
| PIRA | Provisional Irish Republican Army |