User Interface Language. A language that describes the XUI objects to be acted on by the user of an application, and the links between the interface and the underlying C program. UIL makes creating a DECwindows application feasible for mere mortals.

See AIXwindows User Interface Language.

UNIVERSITY INTERSCHOLASTIC LEAGUE. the governing body for all high school competition in the state of Texas. Based at the University of Texas at Austin, the UIL is responsible for determining eligibility standards and hosting the state championship.