What does RU mean in Hardware?

This page is about the meanings of the acronym/abbreviation/shorthand RU in the Computing field in general and in the Hardware terminology in particular.

Rack Unit

A rack unit (RU) is a unit of measure used to describe the height of equipment intended for mounting in a 19-inch rack or a 23-inch rack. One rack unit is 1.75 inches (44.45 mm) high.

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What does RU mean?

ruthenium, Ru, atomic number 44(noun)
a rare polyvalent metallic element of the platinum group; it is found associated with platinum

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"RU." Abbreviations.com. STANDS4 LLC, 2015. Web. 1 Dec. 2015. <http://www.abbreviations.com/term/115174>.