pastie

from Jargon File (4.4.4, 14 Aug 2003)
pastie
 /pay'stee/, n.

   An adhesive-backed label designed to be attached to a key on a
   keyboard to indicate some non-standard character which can be accessed
   through that key. Pasties are likely to be used in APL environments,
   where almost every key is associated with a special character. A
   pastie on the R key, for example, might remind the user that it is
   used to generate the r character. The term properly refers to
   nipple-concealing devices formerly worn by strippers in concession to
   indecent-exposure laws; compare {tits on a keyboard}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
pastie

   /pay'stee/ An adhesive label designed to be attached to a key
   on a keyboard to indicate some non-standard character which
   can be accessed through that key.  Pasties are likely to be
   used in APL environments, where almost every key is associated
   with a special character.  A pastie on the R key, for example,
   might remind the user that it is used to generate the rho
   character.  The term properly refers to nipple-concealing
   devices formerly worn by strippers in concession to
   indecent-exposure laws; compare {tits on a keyboard}.

   [{Jargon File}]
    

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