ISO/IEC 10646
Since 1991, the Unicode Consortium has been working with ISO and IEC to develop the Unicode Standard and ISO/IEC 10646: the Universal Character Set (UCS) in tandem. Newer editions of ISO/IEC 8859 express characters in terms of their Unicode/UCS names and the "U+nnnn" notation, effectively causing each part of ISO/IEC 8859 to be a Unicode/UCS character encoding scheme that maps a very small subset of the UCS to single 8-bit bytes. The first 256 characters in Unicode and the UCS are identical to those in ISO/IEC-8859-1 (Latin-1).