OMR

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

Optical Mark Reader
OMR

   <hardware> (OMR) A special scanning device that can read
   carefully placed pencil marks on specially designed documents.
   OMR is frequenty used in forms, questionnaires, and
   answer-sheets.

   (1995-04-13)

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

OMR
       Optical Mark Reader (Fax)

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

OMR
       Optical Mark Recognition