# Symbols:T

## tera-

- $\mathrm T$

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

Its $\LaTeX$ code is `\mathrm {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.

The $\LaTeX$ code for \(T\) is `T`

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## 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)`

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## 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`

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## General binary operation

- $\intercal$

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`

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