Non-printing format effectors and control codes included in Unicode
Many Unicode 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+0000NULL) 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.
In the narrowest sense, a control code is a character with the general category Cc, which comprises the C0 and C1 control codes, a concept defined in ISO/IEC 2022 and inherited by Unicode, with the most common set being defined in ISO/IEC 6429. Control codes are handled distinctly from ordinary Unicode characters, for example, by not being assigned character names (although they are assigned normative formal aliases).[1] In a broader sense, other non-printing format characters, such as those used in bidirectional text, are also referred to as control characters by software;[2] these are mostly assigned to the general category Cf (format), used for format effectors introduced and defined by Unicode itself.
^"Name Aliases". Unicode Character Database. Unicode Consortium.
^Segan, Danilo. "Towards a localised desktop". For some cases where automatic decision making doesn't work, you can manually add specific direction markers by right-clicking the text field, choosing "Insert Unicode control character" from the menu, and selecting appropriate direction mark. This would allow you, for instance, to start your RTL text with an otherwise LTR word (such as "GNOME").
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