One fourth of a circle or disc; a sector with an angle of 90°.
One of the four regions of the Cartesian plane bounded by the x-axis and y-axis.
A measuring device with a graduated arc of 90° used in locating an altitude.
One of the four categories of team wins and losses, as categorized by strength of schedule.
One of the four sections made by dividing an area with two perpendicular lines.
part of a circle, extending to the center; circular sector
section
a fictional region of space designated for navigational or governance purposes.
a field of economic activity
A fixed, continuous section of the track, such that sectors do not overlap but all sectors make up the whole track.
A toothed gear whose face is the arc of a circle.
an area designated by boundaries within which a unit operates, and for which it is responsible
zone (designated area).
one of the subdivisions of a coastal frontier
an instrument consisting of two rulers of equal length joined by a hinge.
An area of a crag, consisting of various routes
fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium (compare to block)