A single letter or numeral designed for use in marking a sheet of x-ray film for identification at the time of exposure.
NSN 5855-00-631-4565
NSN 4140-00-466-9268
NSN 6110-00-464-1912
NSN 5835-00-998-5757
NSN 5905-00-242-9697
NSN 5835-01-264-8782
NSN 5999-00-739-9665
NSN 7035-01-470-5613
NSN 6240-01-409-2465
NSN 6135-00-170-8819
NSN 5925-01-234-5780
NSN 5920-00-578-0009