Chooses a point at the closest quadrant of a circle
The Quadrant snap places the point at one of the four quadrants of a circle. The quadrant points are located at the furthermost top, bottom, left, and right of the circle. You must choose a circle when using the Quadrant snap. The chosen circle may be divided at the point used by the Quadrant snap, depending on the Options settings.
(Q) shows the four quadrants of a circle