sector

a plane figure bounded by two radii and the included arc of a circle

a social group that forms part of the society or the economy; "the public sector"

a particular aspect of life or activity; "he was helpless in an important sector of his life"

the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes

a portion of a military position

measuring instrument consisting of two graduated arms hinged at one end