Symbols:T

Set

 * $$T$$

Used to denote a general set, often in conjunction with $$S$$ when more than one set is under discussion.

The LaTeX code for $$T$$ is T.

Algebraic Substructure

 * $$T$$

Used to denote a general algebraic substructure, of the algebraic structure $$S$$, in particular a subsemigroup.

In this context, frequently seen in the compound symbol $$\left({T, \circ}\right)$$ where $$\circ$$ represents an arbitrary binary operation.

The LaTeX code for $$\left({T, \circ}\right)$$ is \left({T, \circ}\right).