RF is an abbreviation for radio frequency.
A radio frequency (RF) resonant cavity thruster, also known as an EmDrive, is a controversial proposed type of electromagnetic thruster where an anisotropic electromagnetic field inside the microwave cavity purportedly produces thrust.
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 league was previously known as National Division One and in 2009 changed from a league consisting of semi-professional clubs to one that is now fully professional.
rFactor 2 is a computer racing simulator developed by the American independent software developer Image Space Incorporated.
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.
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.
RFD-TV is an American digital cable and satellite television channel that is owned by Rural Media Group.
An RF module (radio frequency module) is a (usually) small electronic device used to transmit and/or receive radio signals between two devices.
RF Switch or Microwave Switch