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I came across the following equation $$ A = UAV + h.c. $$ For example, please see Eqn (2) in here.

But I have no idea what h.c. stands for... It seems that it comes from some physics.

Any comments or answers will be appreciated. Thanks.

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    $\begingroup$ Maybe Hermitian conjugate. $\endgroup$
    – Christoph Mark
    Commented Apr 1, 2018 at 17:27

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In physics, the abbreviation "h.c." usually stands for "Hermitian conjugate." So, $UAV + h.c. = UAV + (UAV)^\dagger$, where $M^\dagger$ denotes the Hermitian conjugate of the operator $M$.

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