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U is the twenty-first letter of the modern Latin alphabet. U was originally a capital letter like J and it was only Pierre de la Ramée who made the distinction between capital and small letter. See V. Uniform represents the letter U in the NATO phonetic alphabet.
Meanings for UUniversity of Utah or "U of U" (or just University in general). In a 19-inch rack a rack unit, RU, unit or U is a standard height of 1.75 inches (44.45 mm). In biochemistry, U is the symbol for uracil. In calendars, U is often an abbreviation for Sunday, for use when S is being used for Saturday. In chemistry, U is the symbol for uranium. In communication, u is an abbreviation for the word "you" in SMS or instant message. In computing, 1 U (= 44 mm or 1.75 inch) is a standard unit of height of computer chassis, also called a rack unit or a pizza box. In education, U is an unsatisfactory grade. In electrical engineering, U is the symbol for voltage. In linguistics, U refers to speech markers of upper class British speakers. British novelist Nancy Mitford brought to popular attention the linguistic terminology "U" and "non-U" to indicate the speech markers of upper class and non-upper class British speakers respectively. In mathematics, stands for union and the upside-down stands for intersection (both are operators on sets). A U-set is a set of uniqueness. In mathematics, U stands for the unitary group. In military science, U- is a prefix used for German submarines during World War II, (e.g., U-20), which was short for Unterseeboot. They were also referred to as "U-boats" by the Allies. In the Unicode standard, character code points are labelled "U+" followed by a number in hexadecimal. See also
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