U

Unicode

A 16-bit character set capable of encoding all known characters and used as a worldwide character-encoding standard. Windows NT® uses Unicode exclusively; Windows® 95 and Windows® 98 do not.

universal well-known security identifier (SID)

A SID that is meaningful on all secure systems using the security model implemented in Windows NT®.

user-defined pen

A cosmetic or geometric pen that uses a unique series of dashes, dots, or dashes and dots defined by the user. See also cosmetic pen, geometric pen.

UTC

See Coordinated Universal Time.