Ordered Tree
A Rooted Tree in which the order of the subtrees is significant. There is a One-to-One correspondence betweenordered Forests with 
nodes and Binary Trees with nodes.
- Transpose
- Transpose Map
- Transposition
- Transposition Group
- Transposition Order
- Transversal Array
- Transversal Design
- Transversal Line
- Transylvania Lottery
- Trapdoor Function
- Trapezium
- Trapezohedron
- Trapezoid
- Trapezoidal Hexecontahedron
- Trapezoidal Icositetrahedron
- Trapezoidal Rule
- Traveling Salesman Constants
- Traveling Salesman Problem
- Trawler Problem
- Trebly Magic Square
- Tredecillion
- Tree
- Tree-Planting Problem
- Tree Searching
- Trefoil Curve