Character codes in the range 0 through to 255 can be specified in a single byte. Many fonts contain more than 255 glyphs. To support foreign character sets and special symbols, PCL font selection uses a symbol set code to specify a mapping of character glyphs to character positions in the range 0 through 255.
Symbol sets - Follow the links opposite to see how many PCL symbolsets are mapped. For example, in symbolset 3S - PCL ISO 10, Swedish the glyph displayed for the character code 5D is "Å" - "A" with ring. In symbolset 10U - the regular Windows PCL 8 has "]" right square bracket for character code 5D.