Noun
SysRq (uncountable)
(computing) Abbreviation of System request.
One must hold down the Alt key while pressing this “dual-function” key to invoke SysRq. Source: Internet
Personal interview with Sandy Meade, creator of the SysRq key A special key was needed because most software of the day operated at a low level, often bypassing the OS entirely, and typically made use of many hotkey combinations. Source: Internet