title: RD
text: # RD
  
  Rd is an abbreviation for road.
  
  RD or Rd may also refer to:
  
  ## Arts, entertainment, and media
  
  * Real Drive, an anime by Production I.G
  * RD (group), a British girl group also known as Ruff Diamondz
  * Rilindja Demokratike, an Albanian newspaper
  * Reader's Digest, a United States general-interest magazine
  
  ## Businesses and organizations
  
  * USDA Rural Development, an agency of the United States Department of Agriculture
  * Ryan International Airlines (IATA airline designator RD)
  
  ## Military decorations
  
  * Reserve Decoration, an award for service in the Royal Navy Reserve of the United Kingdom
  * Emblem for Reserve Force Service or Reserve Decoration, an award of the South African National Defense Force Military Reserve
  
  ## Science, technology, and mathematics
  
  ### Computing and mathematics
  
  * Rata Die, a calendar-independent system to assign numbers to calendar dates
  * Remote Desktop, a graphical interface to connect one computer to another over a network
  * Rider (software), a cross-platform IDE intended for C# and .NET development
  * Route distinguisher, in data networking, a concept in Multiprotocol Label Switching
  * Ruby Document format, a markup language used for documentation of Ruby programs
  
  ### Health and medicine
  
  * Restrictive dermopathy
  * Reading disability, a condition resulting primarily from neurological factors
  * Registered Dietitian, an expert in dietetics
  * Retinal detachment, a disorder of the eye
  * Risk difference, a term in epidemiology related to absolute risk reduction
  
  ### Other uses in science and technology
  
  * Rate–distortion optimization, a decision algorithm used in video compression
  * Reaktivniy Dvigatel, a Soviet Russian prefix for an engine design series (literally, "reactive engine"; see RD-8 for example)
  * Research and development
  * Pratt & Whitney Rocketdyne, a United States rocket engine company
  * Rutherford (unit), a unit of radioactivity
  
  ## Other uses
  
  * $R^d,$ the mathematical domain of real numbers
  * ‹rd›, a Latin alphabet digraph of a retroflex stop in Aboriginal Australian languages
  * Repair Depot (e.g., 6 Repair Depot), in military use
  * Red Line (Washington Metro)
  * Resident director, a common staff position at universities and colleges with on-campus housing
  * Richmond and Danville Railroad
  * rmdir, a shell command meaning "remove directory"
  * Rural Dean, an ecclesiastical title in Anglicanism
  * Rural delivery service, mail delivery in what are traditionally considered rural areas in the United States
  * Dominican peso (currency symbol: RD$)
  * An English-language ordinal indicator, for ordinal numbers ending in "third" (e.g. 3rd, 23rd, 33rd)
  * A round or cartridge of ammunition
  * An abbreviation of Regional district
  