| Technology Archive Reference - T (not actively used) | |
| TACS | Total Access Communication System |
| TASM | Turbo Assembler (Borland) |
| TCAM | Telecommunications Access Method (IBM OS/360); superceded by VTAM |
| TPI | Tracks Per Inch |
| TSR | Terminate-and-stay-resident program (DOS) |
| TwinVQ | transform-domain weighted interleave vector quantization |
| TINA-C | Telecommunication Information Networking Architecture Consortium (disbanded in 2000) |
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