Symbols:H

Subgroup

 * $H$

Frequently used to represent a general subgroup of a given group $G$.

Function

 * $h \left({x}\right)$

The letter $h$, along with $f$ and $g$, is frequently used to denote a general mapping or function.

The $\LaTeX$ code for $h \left({x}\right)$ is h \left({x}\right).