Symbol  Format  Data 

∈  Code Point  U+2208 
TeX  \in 

SVG 
The (member of) symbol indicates that an expression on the lefthand side of the symbol belongs to or is in the set on the righthand side of the symbol. Typically the symbol is used in an expression like this:
In plain language, this means that the variable is a member of the set of real numbers denoted by the symbol .
The 'not element of' symbol is used in set theory to denote that a particular element does not belong to a specific set.
The contains as member symbol is used to indicate set membership in set theory.
The does not contain as a member symbol is used in set theory to indicate that an element is not part of a set.
The element of symbol describes membership to a set. When reading an equation the symbol can be read as "in" or "belongs to".