Meaning

1. A section.
2. A zone; a designated area.
3. A zone; a designated area.
4. A zone; a designated area.
5. Part of a circle, extending to the center; circular sector.
6. A fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium.
7. An instrument consisting of two rulers of equal length joined by a hinge.
8. A field of economic activity.
9. A toothed gear whose face is the arc of a circle.
10. A fixed, continuous section of the track, such that sectors do not overlap but all sectors make up the whole track.
11. An area of a crag, consisting of various routes