Dual identity - AbsoluteAstronomy.com

Dual identity can refer to:

A secret identity
Secret identity
A secret identity is an element of fiction wherein a character develops a separate persona , while keeping their true identity hidden. The character also may wear a disguise...

, such as Clark Kent and Superman
In mathematics, the coidentity of a dual group object
Group object
In category theory, a branch of mathematics, group objects are certain generalizations of groups which are built on more complicated structures than sets...

or the counit of a coalgebra

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