parm

from Jargon File (4.4.4, 14 Aug 2003)
parm
 /parm/, n.

   Further-compressed form of {param}. This term is an IBMism, and
   written use is almost unknown outside IBM shops; spoken /parm/ is more
   widely distributed, but the synonym {arg} is favored among hackers.
   Compare {arg}, {var}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
parm

   /parm/ Further-compressed form of {param}.  This term is an
   {IBM}ism, and written use is almost unknown outside IBM shops;
   spoken /parm/ is more widely distributed, but the synonym
   {arg} is favoured among hackers.  Compare {var}.

   [{Jargon File}]
    

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