# Symbols:T

## tera-

- $\mathrm T$

The Système Internationale d'Unités symbol for the metric scaling prefix **tera**, denoting $10^{\, 12 }$, is $\mathrm { T }$.

Its $\LaTeX$ code is `\mathrm {T}`

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## Set

- $T$

Used to denote a general set, often in conjunction with $S$ when two such sets are 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 $\struct {T, \circ}$ where $\circ$ represents an arbitrary binary operation.

The $\LaTeX$ code for \(\struct {T, \circ}\) is `\struct {T, \circ}`

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## Topological Space

- $T = \struct {S, \tau}$

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

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

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## 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, and is probably idiosyncratic.

- The $\LaTeX$ code for \(\intercal\) is
`\intercal`

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