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 Supplemen-
tary 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 s 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.th 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 ISO/IEC 10646:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO/IEC 2020 All rights reserved. Unless otherwise specified, or required in the context of its