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2. Extravehicular Mobility Unit - Wikipedia

   en.wikipedia.org/wiki/Extravehicular_Mobility_Unit

   The E.M.U Display and Control Module (DCM). The EMU, like the Apollo/Skylab A7L spacesuit, was the result of 21 years of research and development. [Note 1] It consists of a Space Suit Assembly (SSA) assembly which includes the Hard Upper Torso (HUT), arm sections, gloves, an Apollo-style "bubble" helmet, the Extravehicular Visor Assembly (EVVA), and a soft Lower Torso Assembly (LTA ...

3. Head-mounted display - Wikipedia

   en.wikipedia.org/wiki/Head-mounted_display

   A head-mounted display (HMD) is a display device, worn on the head or as part of a helmet (see helmet-mounted display for aviation applications), that has a small display optic in front of one (monocular HMD) or each eye (binocular HMD). HMDs have many uses including gaming, aviation, engineering, and medicine. [1]

4. Helmet-mounted display - Wikipedia

   en.wikipedia.org/wiki/Helmet-mounted_display

   A helmet-mounted display (HMD) is a headworn device that uses displays and optics to project imagery and/or symbology to the eyes. [1] [2] [3] It provides visual information to the user where head protection is required – most notably in military aircraft. The display-optics assembly can be attached to a helmet or integrated into the design ...

5. Visor (armor) - Wikipedia

   en.wikipedia.org/wiki/Visor_(armor)

   The first recorded European reference to a helmet's visor in the Middle Ages is found in the 1298 will of Odo de Roussillon, which speaks of a heume a vissere. [4] Whether this statement refers to a pivoting visor or a fixed faceplate is not clear; but by the early fourteenth century artistic depictions of moving visors appear quite frequently. [4]

6. Armet - Wikipedia

   en.wikipedia.org/wiki/Armet

   The visor attached to each pivot via hinges with removable pins, as in the later examples of the bascinet. This method remained in use until c. 1520, after which the hinge disappeared and the visor had a solid connection to its pivot. The earlier armet often had a small aventail, a piece of mail attached to the bottom edge of each cheek-piece. [1]

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