RF is an abbreviation for radio frequency.
A radio frequency (RF) resonant cavity thruster, also known as an EmDrive, is a proposed design for a propellant-free drive which would have to violate both conservation of momentum and conservation of energy in order to work.
The RFU Championship, known for sponsorship reasons as the Greene King IPA Championship from 2013–14, is the second tier of the English rugby union league system and was founded in September 1987. The twelve-side league was known as National Division One and in 2009 changed from semi-professional clubs to fully professional.
rFactor 2 is a computer racing simulator developed by the American independent software firm Image Space Incorporated, released for Windows in 2013. Like its predecessor, rFactor, it is designed to be modified and is used by professional racing teams for driver training and race car development.
RFD-TV is an American digital cable and satellite television channel that is owned by Rural Media Group.
RF Micro Devices (also known as RFMD or RF Micro), was an American company that designed and manufactured high-performance radio frequency systems and solutions for applications that drive wireless and broadband communications.
An RF module (radio frequency module) is a (usually) small electronic device used to transmit and/or receive radio signals between two devices.
RFA Argus is a ship of the Royal Fleet Auxiliary operated by the MoD under the Blue Ensign. Italian-built, Argus was formerly the container ship MV Contender Bezant.