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The ancient Greeks used the 24 letters of their alphabet plus three special signs called episemons--vau or digamma or stigma (6), koppa or qoppa (90), and san or sampi ...

An element of order 2 in a group (i.e., an element A of a group such that A^2=I, where I is the identity element).

A gyrobicupola is a bicupola in which the bases are in opposite orientations.

A birotunda in which the bases are in opposite orientations.

A cupolarotunda in which the bases are in opposite orientations.

Johnson solid J_(24).

Johnson solid J_(47).

Johnson solid J_(23).

Johnson solid J_(44).

A type of integral named after Henstock and Kurzweil. Every Lebesgue integrable function is HK integrable with the same value.