accelerator

katalysaattori

kiihdytin

kaasutin

kaasupoljin One who, or that which, accelerates.
A device for causing acceleration.
puhekieltä A substance which speeds up chemical reactions.
puhekieltä An accelerator pedal.
puhekieltä A chemical that reduces development time.
puhekieltä A device that accelerates charged subatomic particles.
puhekieltä A muscle or nerve that speed the performance of an action.
puhekieltä accelerator key
2002, Davis Howard Chapman, Sams Teach Yourself Visual C++ .NET in 21 Days (page 187)

If they had allowed single-character accelerators, Windows wouldn't be able to determine whether the character was input or a shortcut.