WordNet (r) 3.0 (2006):

prom
    n 1: a formal ball held for a school class toward the end of the
         academic year [syn: promenade, prom]

The Free On-line Dictionary of Computing (19 January 2023):

Programmable Read-Only Memory
PROM

    (PROM) A kind of ROM which can be written using a
   PROM programmer.  The contents of each bit is determined by a
   fuse or antifuse.  The memory can be programmed once after
   manufacturing by "blowing" the fuses, which is an irreversible
   process.  Blowing a fuse opens a connection while blowing an
   antifuse closes a connection (hence the name).  Programming is
   done by applying high-voltage pulses which are not encountered
   during normal operation.

   (1995-04-22)