Rack unit A typical section of rack rail, showing rack unit distribution This means that 1 Hammer unit is equal to exactly 19.05 millimetres or 0.75 inches (3/4"). 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). This unit refers to Source's official map creation software, Hammer. Valve's Source game engine uses the Hammer unit as its base unit of length. One HP is 0.2 inches (1/5") or 5.08 millimetres wide. Horizontal pitch (HP) is a unit of length defined by the Eurocard printed circuit board standard used to measure the horizontal width of rack mounted electronic equipment, similar to the rack unit (U) used to measure vertical heights of rack mounted equipment. Many of the unusual units of measurements listed here are colloquial measurements, units devised to compare a measurement to common and familiar objects. For unusual units of measure invented primarily for amusement, see List of humorous units of measurement.Īn unusual unit of measurement is a unit of measurement that does not form part of a coherent system of measurement, especially because its exact quantity may not be well known or because it may be an inconvenient multiple or fraction of a base unit. For units of measure primarily used in countries where English is not the main language, see the article specific to that country, a list of which can be found in the systems of measurement article.
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