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$\mathrm T$

The Système Internationale d'Unités metric scaling prefix denoting $10^{\, 12 }$.

Its $\LaTeX$ code is \mathrm {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


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) .

Topological Space

$T = \left({S, \tau}\right)$

Frequently used, and conventionally in many texts, to denote a general topological space.

The $\LaTeX$ code for \(T\) is T .

General binary operation


Used in 1975: T.S. Blyth: Set Theory and Abstract Algebra to denote an arbitrary binary operation in a general algebraic structure.

It is given the name truc, pronounced trook, French for trick or technique.

Blyth himself suggests that truc could be translated as thingummyjig, but this is linguistically unsupported.

The $\LaTeX$ code for \(\intercal\) is \intercal .