Three Letter Acronym
- RAD Game Tools, a video game development tools provider
- Radiation assessment detector, a scientific instrument on board the Curiosity rover
- Radley railway station, England; National Rail station code RAD
- Rapid-access disc, a high-speed disk drive
- Rapid application development, an iterative application development methodology derived from Information Engineering
- Rational Application Developer, an integrated development environment (IDE) made by IBM's Rational Software division
- Reactive Airway Disease, a.k.a. Reactive Airways Dysfunction Syndrome (RADS)
- Reactive attachment disorder, an emotional disorder
- Rebuilding America's Defenses, the main report of PNAC
- Reflex anal dilatation, a controversial diagnostic technique
- Reichsarbeitsdienst, the National Socialism-era German National Labor Service
- Relative abundance distribution, a measure of biodiversity
- Researchers Alliance for Development, a World Bank multidisciplinary network of researchers
- Restriction site associated DNA markers, a genetic mapping technique
- Responsible Appliance Disposal, a voluntary partnership program that help protect the ozone layer and reduce emissions of greenhouse gases.
- Right Angle Drill, a drill with the chuck mounted 90 degrees (perpendicular) to the main body for use in tight spaces
- Right Axis Deviation, a heart condition where the electrical conduction of the heart is beyond normal limits
- Rite Aid, NYSE stock symbol RAD
- Robot Alchemic Drive, video game
- Royal Academy of Dance, a London-based International dance examination board specialising in Classical Ballet
- Royal Association for Deaf people, British charity
- Rules for Archival Description, a ruleset for the description of archives, published by the Canadian Council of Archives.
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