ISO/IEC 9995-4:2025

International
Standard
ISO/IEC 9995-4
Fourth edition
Information technology —
2025-11
Keyboard layouts for text and office
systems —
Part 4:
Numeric section
Technologies de l'information — Disposition des claviers conçus
pour la bureautique —
Partie 4: Module numérique
Reference number
© ISO/IEC 2025
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© ISO/IEC 2025 – All rights reserved
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Arrangement and location . . 2
5 Division into zones . . 2
6 Arrangement, location and functions of the keys in the numeric zone . 2
7 Allocation of functions to the keys of the numeric zone ZN0 . 3
7.1 General .3
7.2 The "1-2-3" layout .3
7.3 The "7-8-9" layout .5
8 Arrangement, location and functions of the function zone ZN1 . 6
9 Allocation of functions to the keys of the function zone ZN1 . 7

© ISO/IEC 2025 – All rights reserved
iii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations,
governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of document should be noted. This document was drafted in accordance with the editorial rules of the ISO/
IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 35, User interfaces.
This fourth edition cancels and replaces the third edition (ISO/IEC 9995-4:2009), which has been technically
revised.
The main change is as follows:
— layout modified in accordance with the state of the art.
A list of all parts in the ISO/IEC 9995 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.

© ISO/IEC 2025 – All rights reserved
iv
International Standard ISO/IEC 9995-4:2025(en)
Information technology — Keyboard layouts for text and
office systems —
Part 4:
Numeric section
1 Scope
Within the general scope described in ISO/IEC 9995-1, this document specifies the numeric section of a
keyboard and the division of that section into zones.
It specifies the arrangement, the number and the location of the keys in the numeric zone ZN0 and in the
function zone ZN1 of the numeric section, as well as the allocation of functions to the keys.
The numeric zone ZN0 is to be used in keyboards for applications such as text and data processing, general
office environment, banking, point of sales (POS), telematic services, telephony apparatus, home electronic
systems, numerical control of machinery and equipment, input of personal identification number (PIN), etc.
The function zone ZN1 is to be used in keyboards for applications such as data entry, text and data processing,
general office environment, etc.
NOTE Certain of these applications are under the responsibility of the ITU-T.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 9995-1, Information technology — Keyboard layouts for text and office systems — Part 1: General
principles governing keyboard layouts
ISO/IEC 9995-7, Information technology — Keyboard layouts for text and office systems — Part 7: Graphical
symbols used to represent functions
ITU-T Recommendation E.161, Arrangement of digits, letters and symbols on telephones and other devices that
can be used for gaining access to a telephone network
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 9995-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/

© ISO/IEC 2025 – All rights reserved
4 Arrangement and location
The numeric section is generally a rectangular arrangement of keys located to the right or to the left of the
alphanumeric section and the cursor key zone of the editing and function section and below a part of the
editing and function section, see ISO/IEC 9995-1.
5 Division into zones
The numeric section is divided into the numeric zone ZN0 and the function zone ZN1, zones as illustrated in
Figure 1.
NOTE Not drawn to scale — all lines are only indicative.
Figure 1 — Division of the numeric section into zones
6 Arrangement, location and functions of the keys in the numeric zone
The keys shall
...