page_title: ISO/IEC 9995
section_title: ISO/IEC 9995-4
hierarchical_section_title: ISO/IEC 9995 / ISO/IEC 9995-4
caption_attribution_description: English: Numeric section of a German keyboard
context_page_description: ISO/IEC 9995 Information technology — Keyboard layouts for text and office systems is an ISO standard series defining layout principles for computer keyboards. It does not define specific layouts but provides the base for national and industry standards which define such layouts.
  The project of this standard was adopted at ISO in Berlin in 1985 under the proposition of Dr Yves Neuville. The ISO/IEC 9995 standard series dates to 1994 and has undergone several updates over the years.
context_section_description: ISO/IEC 9995-4 specifies the layout of the numeric section of a keyboard, if such one exists. It is subdivided into the function zone (shown with grey background in the left figure) and the numeric zone (shown with white background). The leftmost key in the lowest row may span to the left, occupying the position shown with yellow background.
  The decimal digits 1…9 may be arranged in an “1-2-3 layout” (shown in green, named according to the keys in the D row), or in a ”7-8-9 layout” (shown in blue).
  On a keyboard used for telematic functions, the symbols “” and “#” represent the initiator and the terminator. On a keyboard used for office purposes, the key denoted by “#” shall show the decimal separator (usually a dot or a comma, dependent on the user language). On such keyboards, the key position marked by the asterisk may be an extension of the “0” key, or a “double zero” key. Accordingly, if the yellow key position is used, it may be also an extension of the “0” key, a “double zero” key, or a “triple zero” key.
  The keys in the function zone may be associated to the arithmetic function they denote, or to the arithmetic characters, dependent of the software which is used. If an additional tabulator key or another special key is used, it shall be located at the position C54 (according to the reference grid specified in ISO/IEC 9995-1), thus occupying the lower half of the place shown for the “=” key.
  Numeric sections on usual keyboards for personal computers do not comply to the standard, as they usually have a Num lock key in the upper left corner where the standard requires the “+” key, and therefore also show a different arrangement of the other arithmetic keys (usually lacking an “=” key; see the second picture). By this, the standard in its present form (ISO/IEC 9995-4:2009) can be considered outdated.
caption: Numeric section of a real keyboard
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