Each standard is designated a letter (A-M); in combination with a color system (NTSC, PAL, SECAM), this completely specifies all of the monaural analog television systems in the world (for example, PAL-B, NTSC-M, etc.).
Hvert monokromt system bliver tildelt et bogstav (A-M); i kombination med et farvesystem (NTSC, PAL, SECAM), dette specificerer fuldstændigt alle analoge mono tv-systemer i hele verden (for eksempel PAL-B, NTSC-M, osv.).