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  2. Foot (unit) - Wikipedia

    en.wikipedia.org/wiki/Foot_(unit)

    The foot (standard symbol: ft) [1] [2] is a unit of length in the British imperial and United States customary systems of measurement.The prime symbol, ′, is commonly used to represent the foot. [3]

  3. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    Abbreviation Term Description (notes) AC: Anterior chamber: fluid-filled space between the iris and the endothelium: AC 4/4: Grade 4 anterior chamber angle: open angle between cornea and iris

  4. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    Valve's Source game engine uses the Hammer unit as its base unit of length. This unit refers to Source's official map creation software, Hammer. [1] The exact definition varies from game to game, but a Hammer unit is usually defined as a sixteenth of a foot (16 Hammer units = 1 foot).

  5. Track gauge in Hong Kong - Wikipedia

    en.wikipedia.org/wiki/Track_gauge_in_Hong_Kong

    The MTR uses a gauge of 1,432 mm (4 ft 8 + 3 ⁄ 8 in), 3 mm narrower than the standard gauge. Originally it was to be standard gauge but when the link between the KCR and MTR at Kowloon Tong fell into disuse due to the difference in the choice of voltage for their respective electrification plans, the latter favoured a narrower gauge for ...

  6. MTR CNR Changchun EMU - Wikipedia

    en.wikipedia.org/wiki/MTR_CNR_Changchun_EMU

    The Changchun EMU or CNR Changchun EMU is an electric multiple unit train type of the Mass Transit Railway (MTR) system in Hong Kong. Designed and manufactured by Changchun Railway Vehicles, a member of CNR group (now merged with CSR to form CRRC), they were the first MTR heavy-rail stock to be manufactured in Mainland China, while past orders came from England, Japan, Europe or South Korea.

  7. MTR - Wikipedia

    en.wikipedia.org/wiki/MTR

    The Mass Transit Railway (MTR) is a major public transport network serving Hong Kong.Operated by the MTR Corporation (MTRCL), it consists of heavy rail, light rail, and feeder bus services, centred around a 10-line rapid transit network, serving the urbanised areas of Hong Kong Island, Kowloon, and the New Territories.

  8. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    Factor () Multiple Value Item 0 0 0 Singularity: 10 −35: 1 Planck length: 0.0000162 qm Planck length; typical scale of hypothetical loop quantum gravity or size of a hypothetical string and of branes; according to string theory, lengths smaller than this do not make any physical sense. [1]

  9. Mill test report (metals industry) - Wikipedia

    en.wikipedia.org/wiki/Mill_test_report_(metals...

    A mill test report (MTR) and often also called a certified mill test report, certified material test report, mill test certificate (MTC), inspection certificate, certificate of test, or a host of other names, is a quality assurance document used in the metals industry that certifies a material's chemical and physical properties and states a product made of metal (steel, aluminum, brass or ...