The term 'angular head' refers to a type of head shape that is characterized by a sharp angle between the forehead and the back of the head. This type of head shape is often seen in people with a square or rectangular face shape. It is also associated with certain ethnicities, such as those from East Asia and some Native American tribes. The crossword solution for angular head is 'TRI, ' which is short for triangular, referring to the triangular shape of the head.