Historical
ISO/IEC 9995-4:1994
Information technology - Keyboard layouts for text and office systems - Part 4: Numeric section
Specifies the numeric section of a keyboard and the division of that section into zones. Specifies the arrangement, the number, and the location of the keys in the numeric zone and in the function zones of the numeric section, as well as the allocation of functions to the keys.
International Organization for Standardization [iso]