RD
# 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
