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ISO

ISO/IEC 10646:2020

(Main)

Information technology — Universal coded character set (UCS)

Information technology — Universal coded character set (UCS)

This document specifies the architecture of the UCS; defines terms used for the UCS; describes the general structure of the UCS codespace; specifies the assigned planes of the UCS: the Basic Multilingual Plane (BMP) of the UCS, the Supplementary Multilingual Plane (SMP), the Supplementary Ideographic Plane (SIP), the Tertiary Ideographic Plane (TIP), and the Supplementary Special-purpose Plane (SSP); defines a set of graphic characters used in scripts and the written form of languages on a world-wide scale; specifies the names for the graphic characters and format characters of the BMP, SMP, SIP, TIP, SSP and their coded representations within the UCS codespace; specifies the coded representations for control characters and private use characters; specifies three encoding forms of the UCS: UTF-8, UTF-16, and UTF-32; specifies seven encoding schemes of the UCS: UTF-8, UTF-16, UTF-16BE, UTF-16LE, UTF-32, UTF-32BE, and UTF-32LE; specifies the management of future additions to this coded character set. NOTE The determination of suitability of these characters for use as identifiers in programming languages is not specified by this document but can be found in an external reference. See Annex U.

Technologies de l'information — Jeu universel de caractères codés (JUC)

General Information

Status
Published
Publication Date
20-Dec-2020
ICS
35.040.10 - Coding of character sets
Technical Committee
ISO/IEC JTC 1/SC 2 - Coded character sets
Drafting Committee
ISO/IEC JTC 1/SC 2/WG 2 - Universal coded character set
Current Stage
9092 - International Standard to be revised
Completion Date
14-Jun-2024
Ref Project

Relations

Amended By
ISO/IEC 10646:2020/Amd 1:2023 - Information technology — Universal coded character set (UCS) — Amendment 1: CJK Unified Ideographs Extension H, Vithkuqi, Old Uyghur, Cypro-Minoan, and other characters
Effective Date
06-Jun-2022
Revises
ISO/IEC 10646:2017/Amd 2:2019 - Information technology — Universal Coded Character Set (UCS) — Amendment 2: Nandinagari, Georgian extension, and other characters
Effective Date
23-Apr-2020
Revises
ISO/IEC 10646:2017 - Information technology — Universal Coded Character Set (UCS)
Effective Date
23-Apr-2020
Revises
ISO/IEC 10646:2017/Amd 1:2019 - Information technology — Universal Coded Character Set (UCS) — Amendment 1: Dogra, Gunjala Gondi, Makasar, Medefaidrin, Indic Siyaq Numbers and other characters
Effective Date
23-Apr-2020

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ISO/IEC 10646:2020 - Information technology — Universal coded character set (UCS) Released:21. 12. 2020ISO/IEC 10646:2020 - Information technology — Universal coded character set (UCS) Released:21. 12. 2020
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ISO/IEC 10646:2020 - Information technology -- Universal coded character set (UCS)ISO/IEC 10646:2020 - Information technology -- Universal coded character set (UCS)
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ISO/IEC 10646:2020 - Information technology -- Universal coded character set (UCS)
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Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 10646
Sixth edition
2020-12
Information technology — Universal
coded character set (UCS)
Technologies de l'information — Jeu universel de caractères codés (JUC)
Reference number
ISO/IEC 10646:2020(E)
©
ISO/IEC 2020

---------------------- Page: 1 ----------------------
ISO/IEC 10646:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/IEC 10646:2020 (E)
CONTENTS
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Conformance .8
4.1 General .8
4.2 Conformance of information interchange .8
4.3 Conformance of devices.8
5 Electronic data attachments .9
6 General structure of the UCS . 10
7 Basic structure and nomenclature . 11
7.1 Structure . 11
7.2 Coding of characters . 12
7.3 Types of code points . 12
7.4 Naming of characters . 13
7.5 Short identifiers for code points (UIDs) . 14
7.6 UCS Sequence Identifiers . 14
7.7 Octet sequence identifiers . 15
8 Revision and updating of the UCS . 15
9 Subsets . 15
9.1 General . 15
9.2 Limited subset . 15
9.3 Selected subset. 15
10 UCS encoding forms . 15
10.1 General . 15
10.2 UTF-8 . 15
10.3 UTF-16 . 16
10.4 UTF-32 . 17
11 UC
...

INTERNATIONAL ISO/IEC
STANDARD 10646
Sixth edition
2020-12
Information technology — Universal
coded character set (UCS)
Technologies de l'information — Jeu universel de caractères codés (JUC)
Reference number
ISO/IEC 10646:2020(E)
©
ISO/IEC 2020

---------------------- Page: 1 ----------------------
ISO/IEC 10646:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/IEC 10646:2020 (E)
CONTENTS
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Conformance .8
4.1 General .8
4.2 Conformance of information interchange .8
4.3 Conformance of devices.8
5 Electronic data attachments .9
6 General structure of the UCS . 10
7 Basic structure and nomenclature . 11
7.1 Structure . 11
7.2 Coding of characters . 12
7.3 Types of code points . 12
7.4 Naming of characters . 13
7.5 Short identifiers for code points (UIDs) . 14
7.6 UCS Sequence Identifiers . 14
7.7 Octet sequence identifiers . 15
8 Revision and updating of the UCS . 15
9 Subsets . 15
9.1 General . 15
9.2 Limited subset . 15
9.3 Selected subset. 15
10 UCS encoding forms . 15
10.1 General . 15
10.2 UTF-8 . 15
10.3 UTF-16 . 16
10.4 UTF-32 . 17
11 UC
...

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