Control character

	0x00	0x10
0x00	NUL	DLE
0x01	SOH	DC1
0x02	STX	DC2
0x03	ETX	DC3
0x04	EOT	DC4
0x05	ENQ	NAK
0x06	ACK	SYN
0x07	BEL	ETB
0x08	BS	CAN
0x09	TAB	EM
0x0A	LF	SUB
0x0B	VT	ESC
0x0C	FF	FS
0x0D	CR	GS
0x0E	SO	RS
0x0F	SI	US
0x7F	DEL

In computing and telecommunication, a control character or non-printing character is a code point (a number) in a character set, that does not represent a written symbol. They are used as in-band signaling to cause effects other than the addition of a symbol to the text. All other characters are mainly printing, printable, or graphic characters, except perhaps for the "space" character (see ASCII printable characters).

All entries in the ASCII table below code 32 (technically the C0 control code set) are of this kind, including CR and LF used to separate lines of text. The code 127 (DEL) is also a control character. Extended ASCII sets defined by ISO 8859 added the codes 128 through 159 as control characters, this was primarily done so that if the high bit was stripped it would not change a printing character to a C0 control code, but there have been some assignments here, in particular NEL. This second set is called the C1 set.

These 65 control codes were carried over to Unicode. Unicode added more characters that could be considered controls, but it makes a distinction between these "Formatting characters" (such as the Zero-width non-joiner), and the 65 Control characters.

The Extended Binary Coded Decimal Interchange Code (EBCDIC) character set contains 65 control codes, including all of the ASCII control codes as well as additional codes which are mostly used to control IBM peripherals.

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Wikipedia