ISO/IEC 10646-1:2000 Information technology — Universal Multiple-Octet Coded Character Set (UCS) — Part 1: Architecture and Basic Multilingual Plane" ISO/IEC 10646-1:2000/Amd 1:2002 Mathematical symbols and other characters" ISO/IEC 10646-2:2001 Information technology — Universal Multiple-Octet Coded Character Set (UCS) — Part 2: Supplementary Planes Unicode XML ISO 10646 UTF-8 UTF-16 NFC Unicode normalisation Unicode normalization NFD W3C Character Model Two-table lookup NFKD NFKC