Unicode Control Characters

Many Unicode control characters are used to control the interpretation or display of text, but these characters themselves have no visual or spatial representation. For example, the null character (U+0000 ) is used in C-programming application environments to indicate the end of a string of characters. In this way, these programs only require a single starting memory address for a string (as opposed to a starting address and a length), since the string ends once the program reads the null character.

Read more about Unicode Control Characters:  ISO 6429 Control Characters (C0 and C1), Unicode Introduced Separators, Language Tags, Interlinear Annotation, Bidirectional Text Control, Variation Selectors

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