Definition:Identity/Also known as

Identity: Also known as
Other terms which are seen that mean the same as identity are:
 * Two-sided identity, to reflect the fact that it is both a left identity and a right identity.
 * Neutral element, which is perfectly okay, but considered slightly old-fashioned.
 * Unit element, but this is not recommended as it is too easy to confuse it with a unit of a ring.
 * Unity, but this is generally reserved for a ring unity or unity of field.
 * Zero, but it is best to reserve that term for a zero element.
 * The trivial element, in the context of a group.

The symbols used for an identity element are often found to include $0$ and $1$. In the context of the general algebraic structure, these are not recommended, as this can cause confusion.

Some sources use $I$ for the identity.