U : the twenty-first letter of the English alphabet, is a cursive form of the letter V, with which it was formerly used interchangeably, both letters being then used both as vowels and consonants. U and V are now, however, differentiated, U being used only as a vowel or semivowel, and V only as a consonant. The true primary vowel sound of U, in Anglo-Saxon, was the sound which it still retains in most of the languages of Europe, that of long oo, as in tool, and short oo, as in wood, answering to the French ou in tour. Etymologically U is most closely related to o, y (vowel), w, and v; as in two, duet, dyad, twice; top, tuft; sop, sup; auspice, aviary. See V, also O and Y.

Example:
Can U tell me the best food U like from restaUrants sUchs as mc donalds or white castles or others please?

Taxonomy
University of California, Irvine, Extension, gallery, public health, UC Regents, cascading style sheets, ad-blocking software, disabled, Health Seminar, Week 1, Fog, Mist, Irvine, CA, UC Irvine, Current Students, Alumni, Class Schedule, EEE.

Defination from the web:
Fourth-largest campus of the University of California system.