Within the general scope described in ISO/IEC 9995-1, this part of ISO/IEC 9995 specifies the allocation of letters to the keys of the numeric zone ZNO of a keyboard which has the ten digits zero to nine allocated in the "1-2-3" layout. The layout specified in this part of ISO/IEC 9995 is intended for applications of information technology equipment keyboards where letters instead of digits are used for the mnemonic retention of numeric information.
The use of letters on the numeric zone ZNO for the mnemonic retention of numeric information is strongly deprecated on keyboards which also contain an alphanumeric section. The inclusion of two sets of alphabetical symbols used in different ways could confuse the user of the keyboard.