e/Mean of circular quantities

Information
has gloss	eng: In mathematics, a mean of circular quantities is a mean which is suited for quantities like angles, daytimes, and fractional parts of real numbers. This is necessary since most of the usual means fail on circular quantities. For example, the arithmetic mean of 0° and 360° is 180°, although 0° would be clearly the better choice. This is one of the simplest examples of statistics of non-Euclidean spaces.
lexicalization	eng: Mean of circular quantities
instance of	(noun) a statistic describing the location of a distribution; "it set the norm for American homes" norm, average