U
From Wikipedia, the free encyclopedia
- For other uses of "U", see U (disambiguation).
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The letter U is the twenty-first letter in the Latin alphabet. Its English name is pronounced /juː/.
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.
[edit] Codes for computing
Alternative representations for U
| NATO phonetic | Morse code | ||
| Uniform | |||
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| Signal flag | Semaphore | ASL Manual | Braille |
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 "U" and "u" for upper and lower case respectively.
[edit] Meanings for U
- In astronomy,
- U magnitude is an object's magnitude seen through a U (ultraviolet) filter
- U stands for the planet Uranus; for example, S/2001 U 2 was the second satellite of Uranus sighted in 2001, Ferdinand.
- 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 biochemistry, U is the symbol for uracil. It is also the symbol for enzyme unit, a standard measure of amount of a particular enzyme.
- In Burmese, U is an honorific roughly equal to Mister.
- 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 commerce, a circled U, Ⓤ, on a food product indicates kosher certification by the Orthodox Union.
- In communication, u is an abbreviation for the word "you" in SMS or instant messages.
- In computing:
- 1 U (= 44 mm or 1.75 inch) is a standard unit of height of a piece of equipment or computer chassis in a 19-inch rack, also called a rack unit (RU) or a pizza box.
- 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 education, U is an unsatisfactory grade.
- In electrical engineering, U is one of the recommended symbols for electric or magnetic potential difference (voltage).
- In film, U (Universal) is a British Board of Film Classification rating.
- In geosciences, U stands for the theoretical geopotential, and U-shaped for glaciated valleys
- In history, U is king of Goryeo (Korea).
- In Internet slang, "u" or "U" is referred to as "you" due to the similarity in pronunciation.
- In Japanese, U is a romanization of the kana う and ウ.
- 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 metrology, u is the symbol for the unified atomic mass unit.
- 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 physics,
- 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),
- In sports, U is a common nickname for Universitario de Deportes, one of the most popular soccer teams in Peru.
- 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 thermodynamics, U is the recommended symbol for a system's internal energy.
- In the Unicode standard, character code points are labelled "U+" followed by a number in hexadecimal.
- The U, nickname for several Universities.
[edit] See also
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