| Acronym | Meaning |
| TK | Terakelvin - Tokelau (ISO 3166 Digram) |
| SBCS | Single-Byte Character Set |
| BCCI | Board Of Control For Cricket In India - Bank Of Credit And Commerce International |
| TO | Togo (FIPS 10-4 Country Code) - Tonga (ISO 3166 Digram) |
| TX | Texas (postal Symbol) - Transmit - Turkmenistan (FIPS 10-4 Country Code) |
| ODB | Operational Data Base -Oxford Dictionary Of Byzantium |
| INC | Iglesia Ni Cristo (Filipino |
| HP | IB -Hewlett-Packard Instrument/Interface Bus (first Implementation Of GP-IB |
| PS | Petasecond |
| K/T | Cretaceous/Tertiary Boundary |