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In algebra, the kernel of a homomorphism (function that preserves the structure)
is generally the inverse image of 0
(except for groups whose operation is denoted multiplicatively, where the kernel is the inverse image of 1).

An important special case is the kernel of a linear map.
The kernel of a matrix, also called the null space, is the kernel of
the linear map defined by the matrix.

Formally, a polygon P is star-shaped if there exists a point z such that
for each point p of P the segment zp lies entirely within P.[1]
The set of all points z with this property
(that is, the set of points from which all of P is visible) is called the kernel of P.

Kernel is used in statistical analysis to refer to a window function.
The term "kernel" has several distinct meanings in different branches of statistics.