- twice-exceptional children
- twice firing
- twiddle
- TWIF
- twig
- twig and shoot insect pest
- twig pattern query
- twig pattern query, TPQ
- twig query
- Twigs of Mume Blossoms
- Twilight
- twilight
- twilight brightness
- twilight correction
- twilight emission
- twilight flat
- Twilight Heron
- twilight spectrum
- twilight zone
- twill coating
- twill effect weft-knitted fabric
- Twill Silk and Gauze with Gold-impressed Patterns of the Yuan Dynasty
- twill weave
- twin
- twin-beam model