## SECTOR

### Sector

The**sector**, also known as a

**proportional compass**or

**military compass**, was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century. It is an instrument consisting of two rulers of equal length joined by a hinge. A number of scales are inscribed upon the instrument which facilitate various mathematical calculations. It was used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots. Its several scales permitted easy and direct solutions of problems in gunnery, surveying and navigation. The sector derives ...

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### sector

#### Noun

- Section.
- Zone (designated area).
- A part of a circle, extending to the center.
- A fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium (compare to block).
- An area designated by boundaries within which a unit operates, and for which it is responsible.
- One of the subdivisions of a coastal frontier.
- A fictional region of space designated for navigational or governance purposes; for instance, , .
- An instrument consisting of two rulers of equal length joined by a hinge.
^{W} - A field of activity.

*The above text is a snippet from Wiktionary: sector*

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and as such is available under the Creative Commons Attribution/Share-Alike License.