Symbols:K

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Subgroup

 * $K$

Frequently used, in conjunction with $H$, to represent a general subgroup of a given group $G$ when two such subgroups need to be discussed.

Field

 * $K$

One of the letters used as a variable denoting a general field.

Field as an Algebraic Structure

 * $\left({K, +, \circ}\right)$

The full specification for a field, where $+$ and $\circ$ are respectively the addition and product operations.