Clifford M. said: A rhombus? lol, I was aiming for SQUARE trying to be witty and all that :) In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles. It can also be defined as a rectangle in which two adjacent sides have equal length. In the parlance of jazz, a square was a person who failed to appreciate the medium, or, more broadly, someone who was out of date or out of touch, hence the saying "be there or be square".