The C0 and C1 control code sets define control codes for use in text. C0 originally defined in ISO 646 defines codes in the range 00_HEX-1F_HEX. C1 originally defined in ISO 6429 defines codes in the range 80_HEX-9F_HEX. The C0 codes are used with ascii and most encodings based on it. The C1 codes were included in the ISO-8859-n series of encodings and unicode but are rarely used. ISO 646 is an ISO standard that specifies a 7 bit character code from which several national standards are derived, the best known of which is ASCII. Since the portion of ISO 646 shared by all countries specified only the letters used in the English alphabet, other countries using the... In mathematics and computer science, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... In computing, Unicode provides an international standard which has the goal of providing the means to encode the text of every document people want to store on computers. ...

C0

The null character (also null terminator) is a character with the value zero, present in the ASCII and Unicode character sets, and available in nearly all mainstream programming languages. ... Microsofts disk operating system, MS-DOS, was Microsofts implementation of DOS, which was the first popular operating system for the IBM PC, and until recently, was widely used on the PC compatible platform. ... In telecommunication, an end-of-transmission character (EOT) is a transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings. ... In telecommunication, an end-of-transmission character (EOT) is a transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message headings. ... In the Transmission Control Protocol, ACK packets are used to acknowledge receipt of a packet. ... Bell character is an ASCII control character, code 7 (^G). ... Bell may refer to: Bell (instrument), a simple sound-making device Bell System, the name of Americas telephone system from the 1880s until around 1984 Wind instrument, the bell is the round, flared opening at the opposite end from the mouthpiece, where the sound exits and is amplified... Backspace is the keyboard key that originally pushed the typewriter head one position backwards, and in modern computer displays moves the cursor one position backwards and deletes the preceding character. ... This article is about the use of the term Tab in computing. ... In computing, line feed (LF) is a control character indicating that one line should be fed out. ... In computing, form feed is one of control characters in ASCII.  It forces the printer to eject the current page and to continue printing at the top of another. ... Originally, carriage return was the term for the key, lever, or mechanism on a typewriter that would cause the cylinder on which the paper was held (the carriage) to return to the left side of the paper after a line of text had been typed, and would often move it... Shift Out (SO) and Shift In (SI) are ASCII control characters 14 and 15, respectively (0xE and 0xF). ... Shift Out (SO) and Shift In (SI) are ASCII control characters 14 and 15, respectively (0xE and 0xF). ... In telecommunications, a negative-acknowledge character (NAK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up. ... In telecommunication, the term cancel character (CAN) has the following meanings: 1. ... In computing and telecommunication, an escape character is one which has a special meaning in a sequence of characters. ...

C1

References

• http://www.unicode.org/charts/PDF/U0000.pdf
• http://www.unicode.org/charts/PDF/U0080.pdf