otprom

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

One Time Programmable Read-Only Memory
OTPROM

   <storage> (OTPROM, EPROM OTP) A kind of storage device like an
   {EPROM} but with no quartz glass window in the package for
   erasing the contents.  This reduces the packaging cost but
   means the device cannot be erased with UV and so can only be
   written once.  Erasure is possible, but expensive, with
   X-rays.

   (1995-04-22)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

OTPROM
       One Time Programmable Read Only Memory (ROM, IC)