What is 1U, 2U, 3U, 4U, 5U, 6U, and 7U? - Computer Hope
https://www.computerhope.com/jargon/num/1u.htm
WebNov 13, 2018 · 1U, 2U, 3U, 4U, 5U, 6U, and 7U. Updated: 11/13/2018 by Computer Hope. The 1U, 2U, 3U, 4U, 5U, 6U and 7U are all different sized rackmount servers, and the "U" following the number is short for unit. The number indicates the size of the rackmount, 1U being the smallest rackmount and 7U being the biggest rackmount.
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