Uncovered	Position where the line of engagement is not closed.
Underhand grip	The holding of a dagger or knife with the blade beneath the grip, for the purpose of stabbing, rather than thrusting.
Universal parry	Another name for the parry of prime, as it can cover in one single movement all lines of attack. (So they say.)
Unit	(Film) The whole group of people shooting a film.
Upstage	The band of the stage furthest away from your audience.
Upstage centre	The upper part of centre stage.
Upstage left	The top left hand corner of the stage, as you face the audience.
Upstage right	The top right hand corner of the stage, as you face the audience.