[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] UCS (Universal Multiple-Octet Coded Character Set) UCS-2 UCS-4 Unicode Unicode characters 2nd references Unicode Consortium web site unique identifiers units of measurement Universal Multiple-Octet Coded Character Set (UCS) Unix operating systems text editors unparsed entities URIs namespace maintainer or version URLs relative schemes US-ASCII character sets user stylesheets UTF-16 UTF-8 2nd UTF-8 character encoding |