ISO 2047

ISO 2047 (Information processing – Graphical representations for the control characters of the 7-bit coded character set) is a standard for graphical representation of the control characters for debugging purposes, such as may be found in the character generator of a computer terminal; it also establishes a two-letter abbreviation of each control character.^[1] The graphics and two-letter codes are essentially unchanged from the 1968 European standard ECMA-17^[2] and the 1973 American standard ANSI X3.32-1973.^[3] It became an ISO standard in 1975.^[1] It is also standardized as GB/T 3911-1983 in China, as KS X 1010^[4] in Korea (formerly KS C 5713), and was enacted in Japan as "graphical representation of information exchange capabilities for character" JIS X 0209:1976 (former JIS C 6227) (abolished January 20, 2010).

While the ISO/IEC 646 three-letter abbreviations (such as "ESC"), or caret notation (such as "^[") are still in use, the graphical symbols of ISO 2047 are considered outdated and rare.^[5]