ECMA-23

This Standard defines three types of layout for graphic keys depending upon the type of application for which the keyboard is intended. It is concerned only with the nominal relative positions of the keys. The figures are intended to express the nominal relative positions of the keys, and are not intended to define physical factors, such as key spacing, keyboard slope, size and shape of key tops and of the space bar, nor the way in which the key tops are labelled.

The key position numbers, where shown, are for reference purposes only, and are in accord with the key numbering system currently in use in ISO.