ISO/IEC 9995-3:2010

Overview

ISO/IEC 9995-3:2010 specifies complementary layouts of the alphanumeric zone for text and office keyboards. As part of the ISO/IEC 9995 series, this part defines how a set of graphic characters (the common secondary group and the complementary Latin group) are allocated to keys so that a minimum Latin-character repertoire (MES‑1 from ISO/IEC 10646) and useful extensions can be entered reliably across national keyboard variants. The standard is intended primarily for word‑processing and text‑processing environments and aims to produce a unified, predictable user–machine interface for Latin-script input.

Key topics and requirements

• Scope and purpose: Defines character allocation on the alphanumeric zone to allow input of MES‑1 and additional Latin characters (including support for Vietnamese and some Canadian aboriginal letters).
• Common secondary group (Group 2): Specifies two layouts (current and outdated). Implementations must allocate the graphic characters of Group 2 exactly as defined in the standard (see Table 1 / Table 2) unless a declared subset or the outdated layout is explicitly used.
• Primary group (Group 1) conformance: The primary group must follow a national keyboard standard, a layout established by common use, or the complementary Latin group defined in Clause 6 of the document.
• Minimum hardware requirement: Requires a keyboard with at least 48 graphic keys as per ISO/IEC 9995‑2.
• Character encoding: The standard does not mandate specific encodings but requires implementations to map characters to their ISO/IEC 10646 (U+) identifiers.
• Duplication and compatibility: Some characters may appear in both primary and secondary groups to ensure consistent access across national layouts.

Practical applications and users

ISO/IEC 9995-3:2010 is useful for:

• Keyboard manufacturers designing hardware layouts for international markets.
• Operating system and firmware developers implementing input methods and keymaps.
• Software localization teams ensuring consistent character entry for Latin-script languages.
• Standards bodies and procurement specifying keyboard requirements for public administration, education, or enterprise deployments.
• Typeface and input-method vendors needing predictable key allocations for typographic symbols (e.g., €, ®, en/em dash) and combined diacritics.

Implementing this standard helps ensure cross‑country consistency, easier localization, and comprehensive support for European and many other Latin‑based languages.

Related standards

• ISO/IEC 9995‑1 - General principles governing keyboard layouts
• ISO/IEC 9995‑2 - Alphanumeric section (hardware/key counting)
• ISO/IEC 10646 - Universal Multiple‑Octet Coded Character Set (UCS)
• Other parts of ISO/IEC 9995 (Part 4, Part 5, Part 7, Part 8) cover numeric, editing/function sections and symbols.