Q is the designator assigned to published RNAV routes used by the United States.
The barometric pressure used for the standard altimeter setting (29.92 inches Hg.).
The barometric pressure as reported by a particular station.
A quarter part of a circle, centered on a NAVAID, oriented clockwise from magnetic north as follows: NE quadrant 000-089, SE quadrant 090-179, SW quadrant 180-269, NW quadrant 270-359.
A feature of the EAS and ARTS which provides the controller the capability to display full data blocks of tracked aircraft from other control positions.