# Symbols:Set Theory/Deprecated Symbols/Subset

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## Subset

$\subset$ is sometimes used to mean:

- $S$ is a subset of $T$

in the sense that $S$ is permitted to equal $T$.

That is, for which we have specified as $S \subseteq T$.

Although many sources use this interpretation, it is **emphatically not recommended**, as it can be the cause of considerable confusion.