Recommendation ITU-T T.55 recommends that for the representation, transmission, interchange,
processing, storage, and presentation of written form of the languages of the world, as well as
additional symbols, the universal multiple-octet coded character set (UCS) specified in
ISO/IEC 10646 be used.
ITU-T T.55-2008 history
2008ITU-T T.55-2008 Use of the universal multiple-octet coded character set (UCS) (Study Group 16)