U

U, letter of the alphabet

U, 21st letter of the alphabet, corresponding to the Greek upsilon [Gr.,=u without the aspirate]. Until the late Middle Ages the capital was V, the minuscule u, no distinction being made between the consonantal and vocalic uses of the letter. The fixing of modern orthography, however, has restricted u to the vowel, v to the consonant. In phonetics ŭ usually represents a high back rounded vowel, rather like in foot; English ū is a triphthong of y, , and w as in utensil; the Continental ū, or , is a diphthong of and w, as in glue. In chemistry, U is the symbol of the element uranium.

---

U, Burmese honorific

U, honorific used in Myanmar. See second part of name (e.g., Thant, U).

---

(Unit) A unit of measurement (1.75") of the height of a rack-mounted device. Thus, a 1U product has a vertical measurement of 1.75"; 2U is 3.5"; 3U is 5.25" and so on. See rack mounted. See also U interface.

A Lot of Electronics in Only 1U

This Xtore Extreme (www.xtore-es.com) storage server packs a lot of punch in a 1U case, including two CPUs, multiple drives and multiple power supplies.