a written or printed symbol

a variant form of a grapheme, as `m' or `M' or a handwritten version of that grapheme

a character that is added to the end of a block of transmitted data and used to check the accuracy of the transmission

a character or symbol set or printed or written above and immediately to one side of another character

a character or symbol set or printed or written beneath or slightly below and to the side of another character

any member of the standard code for representing characters by binary numbers