In the UPC symbology, a character is defined as having two bars 16 and {HEAD ~ two spaces} 18 of {TAIL ~ varying widths} 
of
In the UPC symbology , a character is defined as having two bars 16 and { HEAD ~ two spaces } 18 of { TAIL ~ varying widths }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL