(rail transport, UK) Of a level crossing, one where a railway crosses a right of way such as a road on private land, a footpath or a bridleway. Any gates or barriers provided often need to be operated manually, with some crossings requiring users to telephone a signaller to check that it is safe to cross.

(computing) Created or defined by the user of a system, rather than being included in the original package.

plural of user page

(wikis) The main page associated with a particular editor, often including autobiographical and personal content, testing and drafts, notices, etc.

(computing) A type of user interface which allows people to interact with a computer through a metaphor of direct manipulation of graphical images and widgets in addition to text.

(Internet) A communications protocol that has no error recovery features, and is mostly used to stream material over the Internet.

(computing) A program or subroutine, provided by the user rather than being built into the system, that may return a value and may take input parameters.

plural of character user interface

(computer games) A text-based online game in which players enter instructions on a command line to jointly engage in role-playing. MUDs are a precursor to the massively multiplayer online game.

(computing, dated) A graphic symbol defined by the user, replacing one of the text characters in the computer's character set.