RD

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Rd is an abbreviation for road. It may also refer to:

• Round of ammunition
• rd, also called rmdir, a shell command meaning "remove directory"
• R^d, the mathematical domain of real numbers
• ‹rd›, a Latin alphabet digraph of a retroflex stop in Aboriginal Australian languages

RD may refer to:

Arts and entertainment

• RD, Real Drive, an anime by Production I.G
• RD (group), a British girl group also known as Ruff Diamondz
• RD, Rilindja Demokratike, an Albanian newspaper

Businesses and organizations

• USDA Rural Development, an agency of the United States Department of Agriculture
• Ryan International Airlines (IATA airline designator RD)

Military decorations

• RD, Decoration for Officers of the Royal Naval Reserve, or Reserve Decoration, an award for service in the Royal Navy Reserve of the United Kingdom
• Emblem for Reserve Force Service, Reserve Decoration, or Reserve Force Distinction or Decoration, an award of the South African National Defense Force Military Reserve

Science, technology, and mathematics

Computing and mathematics

• RD, Rata Die, a calendar-independent system to assign numbers to calendar dates
• Rider, 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; that is, human nutrition and the regulation of diet (USA)
• 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
• Rocketdyne, a United States rocket engine company
• Rutherford (unit), a unit of radioactivity

Other uses

• Dominican peso (currency symbol RD$)
• An English-language ordinal indicator, for ordinal numbers ending in "third" (e.g. 3rd, 23rd, 33rd)
• Repair Depot (e.g., 6 Repair Depot), in military use
• Resident Director, a common staff position at universities and colleges with on-campus housing
• Rural Delivery, mail delivery in what are traditionally considered rural areas in the United States
• Rural Dean, an ecclesiastical title in Anglicanism
• Richmond and Danville Railroad, predecessor railroad to the Southern Railway (U.S.)