Wiktionary
alt. 1 A semitransparent graphical and textual display of information projected upon the field of view of a pilot of an aircraft. Abbreviation: '''HUD''' 2 (context nautical English) A type of radar or electronic chart display where the top of the display always represents the direction the vessel is heading. n. 1 A semitransparent graphical and textual display of information projected upon the field of view of a pilot of an aircraft. Abbreviation: '''HUD''' 2 (context nautical English) A type of radar or electronic chart display where the top of the display always represents the direction the vessel is heading.
Wikipedia
A head-up display or heads-up display, also known as a HUD, is any transparent display that presents data without requiring users to look away from their usual viewpoints. The origin of the name stems from a pilot being able to view information with the head positioned "up" and looking forward, instead of angled down looking at lower instruments. A HUD also has the advantage that the pilot's eyes do not need to refocus to view the outside after looking at the optically nearer instruments.
Although they were initially developed for military aviation, HUDs are now used in commercial aircraft, automobiles and other, mostly professional applications.
Usage examples of "head-up display".
The head-up display projected on the windshield in front of him reported 625 knots Indicated Air Speed, a hundred six feet of altitude, a heading of 013, and around the numbers was a monocolor holographic image of the terrain before him.
His HUD, head-up display, was a thick visor that covered most of his face above the nose, black to Bisesa’.
His channels are jabbering away in a corner of his head-up display, throwing compressed infobursts of filtered press releases at him.
He checked the oxygen and air mix readings on his helmet's head-up display, then did a quick check of his own faculties.
Like a head-up display coming on line, like airlock bolts slamming back in my head.
Hunter re-armed his 20mm rapid fire cannon and looked through his Head-Up Display at the oncoming Fulcrums.
The red glow was a head-up display, printing out across the bowl of the spacesuit faceplate I was lying trapped beneath.
Lon watched the seconds tick off on his head-up display's timeline.
Fortunately, it was hard enough in the modern age to see your target as anything more than a dot that had to be circled by the head-up display of the fire-control system.