| Acronym | Meaning |
| NTSB | National Transportation Safety Board |
| LL | Land Line (telephone) - Last Log - Late Latin - Left Limit - Lex Luthor (Superman Character) - Light Line - Limited Liability - Linked List - Little League |
| PUS | United States Miscellaneous Pacific Islands (ISO 3166 Trigram; Obsolete 1986) |
| HAZ | Heat-Affected Zone |
| LHS | Left Hand Side |
| OP | Observation Point/Post |
| PRBO | Point Reyes Bird Observatory |
| NAU | Nauruan Language (ISO 639-2 Code) |
| CONMEBOL | Confederaci›n Sudamericana De Fœtbol (Spanish |
| TAT | Tatar Language (ISO 639-2 Code) |