NEN EN 1332-3 : 2008

Foreword
      Introduction
1 Scope
2 Normative References
3 Definitions
4 Functional Sections of the Keypad
      4.1 Function keys
      4.2 Keypad
             4.2.1 Numeric keys
             4.2.2 Command keys
             4.2.3 Principles for the arrangement of
                      command keys
5 Design Requirements and Recommendations
      5.1 General design recommendations
      5.2 Colour and keypad surface
      5.3 Number and positioning of key legends
      5.4 Indication of function on keycap
6 Conformance
7 Labelling and Packaging

Defines the arrangement, the number and location of numeric, function and command keys, including placement of alphabetic characters on numeric keys.