Computers
- Atari TT, a computer based on the Motorola 68030 CPU
- Truth-table reduction (or tt-reduction), a kind of transformation used in computability theory
- TrueType, a font format
- Template Toolkit, a Perl template engine
- "TT", an emoticon indicating tears streaming from the eyes
- ..., an HTML presentation element that writes text in monospace font
- .tt, the country code top-level domain for Trinidad and Tobago
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