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  2. Head-up display - Wikipedia

    en.wikipedia.org/wiki/Head-up_display

    HUD of an F/A-18 Hornet. A head-up display, or heads-up display, [1] also known as a HUD (/ h ĘŚ d /) or head-up guidance system (HGS), is any transparent display that presents data without requiring users to look away from their usual viewpoints.

  3. Crosshair (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Crosshair_(disambiguation)

    "Crosshair", a song by the Danish band Blue Foundation. Cross Hair , fictional G.I. Joe character. Crosshairs (Transformers), several robot superhero characters in the Transformers robot superhero franchise. Crosshair (Star Wars), a deformed clone trooper and former member of The Bad Batch in the Star Wars franchise.

  4. Stadia mark - Wikipedia

    en.wikipedia.org/wiki/Stadia_mark

    Stadia marks on a crosshair while viewing a metric levelling rod. The top mark is at 1.500 m and the lower is at 1.345 m. The difference between the rod readings is 0.155 m, yielding a distance to the rod of 15.5 m. A typical surveyor's instrument reticle has two pairs of stadia marks. One pair are on the horizontal centreline and the other on ...