∋
Symbol  Format  Data 

∋  Code Point 
U+220B 
TeX 
\ni 

SVG 
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 indicates that an expression belongs to or is in the set.
The 'not element of' symbol is used in set theory to denote that a particular element does not belong to a specific set.