Formulas
- Triangular hebesphenorotunda
- Triangular number
- Triangular orthobicupola
- Triaugmented triangular prism
- Tridiminished icosahedron
- Trie
- Trigonometric functions of matrices
- Troland
- Truncated triangular trapezohedron
- Truth function
- Tuning fork
- Turbulence
- Turbulence kinetic energy
- Turn (angle)
- Tutte theorem