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Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...
The industry-standard rack cabinet is 42U tall; [1] however, many data centers have racks taller than this. [2] The term relay rack appeared first in the world of telephony. [3] By 1911, the term was also being used in railroad signaling. [4] There is little evidence that the dimensions of these early racks were standardized. Telephone ...
A diamond-shaped wooden nine-ball rack, racker's view: 1 ball in front, 9 ball centered.. In nine-ball, the basic principles are the same as detailed in the eight-ball section above, but only balls 1 through 9 are used; the 1 ball is always placed at the rack's apex (because in nine-ball every legal shot, including the break, must strike the lowest numbered ball first) over the table's foot ...