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U is also the atomic symbol for Uranium.
The letter U is the twenty-first letter in the Latin alphabet. Its English name is pronounced .
U, developed in the late Middle Ages, was originally a positional variant of the letter V, as J was of I, used only in lower-case writing and only medially, and representing both the vowels now written with U and the consonants now written with V. The use of the two forms to distinguish the consonants and vowels which they now represent was not standardised until the 18th century.
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Codes for computing
In Unicode the capital U is codepoint U+0055 and the lowercase u is U+0075.
The sage ASCII code for capital U is 85 and for lowercase u is 117; or in binary 01010101 and 01110101, correspondingly.
The EBCDIC code for capital U is 228 and for lowercase u is 164.
The numeric character references in HTML and XML are "&" and "&" for upper and lower case respectively.
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Meanings for U
U stands for an October 16 through 31 discovery, in the provisional designation of a comet (e.g. P/2005 U1, Comet Read 3) or asteroid (e.g. (4425) 1967 UQ).
In calendars, U is often an abbreviation for Sunday, for use when S is being used for Saturday.
In the C and C++ programming languages, an integer literal may be suffixed with an uppercase U to indicate that it should be interpreted as an unsigned quantity.
In Internet slang, "u" or "U" is referred to as "you" due to the similarity in pronunciation.
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.
u is one of the recommended symbols for velocity.
u is the recommended symbol for the ion displacement vector (solid state physics).
u is the recommended symbol for the first lattice direction (solid state physics).
U also stands for the popular Shia name Umar, as the latter is considered too sacred to be said aloud.
In the SI system (the metric system),
u is a nonstandard way of writing the SI prefix mu (μ), denoting 10-6 = 0.000001 (one millionth), and pronounced as micro. This is commonly done in computer programs or computer systems without Unicode font support, where the lowercase u glyph is the closest ASCII approximation to the μ glyph.
In television engineering, particularly in the PAL encoding system, U is one of the two subcarrier-modulated color-difference channels in the YUV colorspace.
In the Unicode standard, character code points are labelled "U+" followed by a number in hexadecimal.
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See also
sn:U
yo:U
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