any key

from The Free On-line Dictionary of Computing (8 July 2008)

any key

   <humour, hardware> The key that particularly confused {users}
   look for on their computer keyboards when instructed to "Press
   any key to continue".  "But my keyboard doesn't have a key
   labelled 'any'!".

   Compaq FAQ
   (http://web14.compaq.com/falco/detail.asp?FAQnum=FAQ2859).

   (2003-09-30)