Elevation
The angle at which hair is held away from the head while cut, which decides how layered it becomes.
Also: projection, lifting angle
Elevation is the angle hair is lifted from the head while it is cut. At zero degrees the hair hangs straight down and is cut in a single line, giving a one-length or blunt cut. At about 45 degrees the result is graduation, with short hair stacked under longer hair. At 90 degrees, straight out from the head, the cut gives uniform layers, and higher angles give longer layers on top. Elevation is one of the main tools of precision cutting.