ISO/IEC 9995-4:1994

Within the general scope described in part 1 of ISO/IEC 9995 this part of ISO/IEC 9995 specifies the numeric section of a keyboard and the division of that section into zones. It specifies the arrangement, the number, and the location of the keys in the numeric zone ZNO and in the function zones ZN1 to ZN6 of the numeric section, as well as the allocation of functions to the keys. The numeric zone ZNO is to be used in keyboards for applications such as text and data processing; general office environment; banking; point of sales (POS); telematic services; telephony apparatus; home elec­tronic systems; numerical control of machinery and equipment; input of personal identification number (PIN); etc.  The function zones ZN1 to ZN6 are to be used in keyboards for applications such as data entry, text and data processing, general office environment, etc.