Places
* Sector, West Virginia, U.S.Geometry
* Circular sector, the portion of a disc enclosed by two radii and a circular arc * Hyperbolic sector, a region enclosed by two radii and a hyperbolic arc * Spherical sector, a portion of a sphere enclosed by a cone of radii from the center of the sphereSocial and economic
* Business sector, part of the economy which involves the trading and sale of products by companies * Economic sector, the manufacturing, finance and production of goods for consumers * Private sector, business activity created by private enterprise for profit * Public sector, delivers social services, infrastructure and institutions administered by government * Voluntary sector, a non-profit and voluntary part of an economy provided by organisations * The sector of the sector directive in government procurement in the European UnionComputing
* Cylinder-head-sector, an early method for giving addresses to blocks of data on a hard drive * Disk sector, a subdivision of a track on a disk * Sector, or zone, in portal rendering * Sector/Sphere, an open source software suite * Sector (instrument), a historic calculating instrumentOther uses
* Sector (country subdivision) * United States Coast Guard Sector, a shore-based unit of the U.S. Coast Guard * Sector, a fictional area of space, e.g. in the ''Foundation'' series, ''Star Wars'', ''StarCraft'', ''Warhammer 40,000'', ''Lollipop Chainsaw'' ** Sector, or galactic quadrant, regions of space in ''Star Trek'' * Sector, and Sector No Limits, watch brandsSee also
* * * * Area (disambiguation) * Region (disambiguation) * Zone (disambiguation) * ''