Null
The first character in the ASCII and EBCDIC character codes. In hex, it prints
as 00; in decimal, it prints as a blank. Null is also used to denote that a
value or password has never been set to any value. Null is also the result of a
binary table (byte) that contains no 1 bits. It is also used to pad fields and act as a
delimiter. For example, in the C Language programming language, it specifies the end of a character string.