Geography

Transportation

• RegionsAir
  RegionsAir
  RegionsAir was a Part 121 regional airline. Its headquarters and maintenance base were located at the Smyrna Airport in Smyrna, Tennessee, USA|. The hub airports for RegionsAir were Lambert-St...
  
  , an airline based in the United States
• Regional airline
  Regional airline
  Regional airlines are airlines that operate regional aircraft to provide passenger air service to communities without sufficient demand to attract mainline service...
  
  , any airline that services a limited area, or any of several specific regional airlines, including
  • Regional Air (Papua New Guinea)
    Regional Air (Papua New Guinea)
    Regional Air is an airline based in Madang, Papua New Guinea. It operates scheduled and charter passenger services. Its main bases are Madang Airport and Jacksons International Airport, Port Moresby.- Fleet :...
    
    , an airline based in Papua New Guinea
  • Regional Air
    Regional Air
    Regional Air was an airline based in Nairobi, Kenya. It was Airkenya's jet operation providing scheduled services. It was based at Jomo Kenyatta International Airport, Nairobi. It suspended operations in 2005. -Code data:*IATA Code: QT...
    
    , a defunct airline formerly based in Kenya
  • Regional Air Lines
    Regional Air Lines
    Royal Air Maroc Express is a private airline based in Casablanca, Morocco. It operates scheduled domestic services and scheduled regional flights to Spain and Portugal, as well as charter services for tour operators and corporate clients. Its main base is Mohammed V International Airport.- History...
    
    , an airline based in Morocco
  • Regional Air Services (Czech Republic), an airline based in the Czech Republic
  • Regional Air Services (Tanzania)
    Regional Air Services (Tanzania)
    Regional Air Services is an airline based in Arusha, Tanzania. It is the Tanzanian division of Airkenya and operates domestic services and charter flights in East and Southern Africa .-History:...
    
    , an airline based in Tanzania
  • Regional Express Airlines
    Regional Express Airlines
    Regional Express Pty Ltd is an airline based in Wagga Wagga, New South Wales, Australia. It operates scheduled regional services. It is Australia's largest regional airline outside the Qantas group of companies and serves New South Wales, South Australia, Victoria, North Queensland and Tasmania...
    
    , an airline based in Australia
  • Regional 1, an airline based in Canada
  • Regional Pacific Airlines
    Regional Pacific Airlines
    Regional Pacific Airlines was an airline based in Queensland, Australia. It was established and started operations in May 2001 and operated scheduled services from Horn Island in Queensland ....
    
    , a defunct airline based in Australia
  • Régional
    Régional
    Régional Compagnie Aérienne Européenne, or Régional for short, is a subsidiary airline wholly owned by Air France which connects hubs at Paris, Lyon, Clermont-Ferrand, and Bordeaux to 49 airports in Europe. The airline operates in Air France livery, retaining its name in small titles and logo on...
    
    , an airline based in France

• Regional Railways
  Regional Railways
  Regional Railways was one of the three passenger sectors of British Rail created in 1982 that existed until 1996, 3 years after privatisation. The sector was originally called Provincial....
  
   one of the three former passenger sectors of British Rail from 1981 to 1996
• Regional (Amtrak)
  Regional (Amtrak)
  The Northeast Regional is an intercity rail service operated by Amtrak in the Northeastern United States. In the past, it has also been known as the NortheastDirect, Acela Regional, and Regional. It is by far the busiest Amtrak route, carrying 7.15 million passengers in fiscal year 2010...
  
  , a train line that runs between Massachusetts and Virginia

Computer science

• Region-based memory management
  Region-based memory management
  In computer science, region-based memory management is a type of memory management in which each allocated object is assigned to a region. A region, also called a zone, arena, or memory context, is a collection of allocated objects that can be efficiently deallocated all at once...
  
  , a memory management
  Memory management
  Memory management is the act of managing computer memory. The essential requirement of memory management is to provide ways to dynamically allocate portions of memory to programs at their request, and freeing it for reuse when no longer needed. This is critical to the computer system.Several...
  
   technique in which allocations are organized into regions and all objects in a region can be deallocated at once.
• In raster graphics
  Raster graphics
  In computer graphics, a raster graphics image, or bitmap, is a data structure representing a generally rectangular grid of pixels, or points of color, viewable via a monitor, paper, or other display medium...
  
  , a region is a data structure used to represent an arbitrary set of pixels (in Apple QuickDraw
  QuickDraw
  QuickDraw is the 2D graphics library and associated Application Programming Interface which is a core part of the classic Apple Macintosh operating system. It was initially written by Bill Atkinson and Andy Hertzfeld. QuickDraw still exists as part of the libraries of Mac OS X, but has been...
  
  ) or series of shapes (Microsoft Windows
  Microsoft Windows
  Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...
  
   Graphics Device Interface
  Graphics Device Interface
  The Graphics Device Interface is a Microsoft Windows application programming interface and core operating system component responsible for representing graphical objects and transmitting them to output devices such as monitors and printers....
  
   or X Window System
  X Window System
  The X window system is a computer software system and network protocol that provides a basis for graphical user interfaces and rich input device capability for networked computers...
  
  ) to be drawn on the screen.
• In digital audio editing
  Digital audio editor
  A digital audio editor is a computer application for audio editing, i.e. manipulating digital audio. Digital audio editors are the main software component of a digital audio workstation.-For use with music:...
  
  , a region is a reference to a portion of an audio file.

Mathematics

• Region (mathematical analysis)
  Region (mathematical analysis)
  In mathematical analysis, the word region usually refers to a subset of \R^n that is open , connected and non-empty. A closed region is sometimes defined to be the closure of a region....
  
  , a non-empty
  Empty set
  In mathematics, and more specifically set theory, the empty set is the unique set having no elements; its size or cardinality is zero. Some axiomatic set theories assure that the empty set exists by including an axiom of empty set; in other theories, its existence can be deduced...
  
  , open
  Open set
  The concept of an open set is fundamental to many areas of mathematics, especially point-set topology and metric topology. Intuitively speaking, a set U is open if any point x in U can be "moved" a small amount in any direction and still be in the set U...
  
  , and connected
  Connectedness
  In mathematics, connectedness is used to refer to various properties meaning, in some sense, "all one piece". When a mathematical object has such a property, we say it is connected; otherwise it is disconnected...
  
   set.

Corporations

• Regions Financial Corporation, a banking and financial services company headquartered in Birmingham
  Birmingham, Alabama
  Birmingham is the largest city in Alabama. The city is the county seat of Jefferson County. According to the 2010 United States Census, Birmingham had a population of 212,237. The Birmingham-Hoover Metropolitan Area, in estimate by the U.S...
  
  , Alabama
  Alabama
  Alabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
  
  , United States
  United States
  The United States of America is a federal constitutional republic comprising fifty states and a federal district...
  
  

Fiction

• Region, a small location in Tolkien's Middle-earth fictional universe