Symbols:T

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Set

 * $T$

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

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.