The term 'Pivot Line' is a term used in geometry to describe a line that passes through the center of a circle or other shape. The pivot line is also known as the AXIS, which is a four-letter word that can be used to solve a crossword puzzle. The pivot line is an important concept in geometry because it is used to measure angles and distances between points on a circle or other shape. It is also used to determine the center of a circle or other shape.