A shape with 24 sides is called an icosikaitetragon. Greek prefixes are used for naming shapes by the number of sides. Numbers above 20 have additional special rules that must be followed to construct their names.
In naming polygons that have more than 20 sides, the number in the 10's place is represented by a specific Greek prefix. This prefix is combined with a prefix representing the one's place by using the word "kai" in the middle. Kai means "and" in the Greek language. The word is completed by ending it with "gon". Numbers from 100 to 999 follow additional rules for name construction.