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The colour location describes the position of a measured or selected colour within a colour space. This is often defined by coordinates, e.g. using L, a and b in the CIELab colour space.
The set of all the colour locations in a colour space is called the colour gamut (or gamut).
HLC is an easy to understand representation of the CIELAB colour space. It has an identical vertical L-axis. The horizontal position of a colour location is determined here by the angle H to the positive a-axis (counterclockwise and in the unit degree) and the radius C, the distance to the L-axis.