control character
ASCII control character

Lower case and control characters were provided for by "shift" characters.

The set of control characters helped in preparation and reproduction of documents.

Printing attributes were set directly into the document using control characters.

Note the absence of control characters, especially carriage return and line feed.

The string handling is prone to errors, especially with embedded control characters.

None of the variations (nor the original) have room for control characters, 0x20 is the space character.

Other systems translate these keys into control characters when the control key is held down.

It offers a convenient way of sending a number of control characters to the screen.

Most of the control characters are no longer used for their original purpose.

Symbols, including control characters, are relevant for their meaning, not their speech.