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Latin alphabet Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx Yy Zz

U is the twenty-first letter of the modern Latin alphabet.

U 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 consonants and vowels was not made until modern times.

Contents 1 Alternative representations 1.1 Computing 2 Meanings for U 3 See also

Alternative representations

Uniform represents the letter U in the NATO phonetic alphabet.

In international Morse code the letter U is DitDitDah: · · -

In Braille the letter U is represented as ⠥ (in Unicode), the dot pattern:

X.
..
XX

Computing

In Unicode the capital U is codepoint U+0055 and the lowercase u is U+0075.

The 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.

Meanings for U

• 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 a piece of equipment or computer chassis in a 19-inch rack, also called a rack unit (RU) or a pizza box.
• In education, U is an unsatisfactory grade.
• In electrical engineering, U is the symbol for voltage.
• In history, U is king of Goryeo (Korea).
• 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 also stands for the popular Shia name Umar as Umar is seen as too sacred to be said aloud.
• 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 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 the Unicode standard, character code points are labelled "U+" followed by a number in hexadecimal.
• University of Miami, owing to its distinctive split-U logo.
• University of Utah or "U of U" (or just University in general).
• In Internet slang, "u" or "U" is referred to as "you" due to the similarity in pronunciation.

See also

• Ù
• Ú
• Û
• Ü
• Ŭ
• Ű
• Ů

Two-letter combinations Ua Ub Uc Ud Ue Uf Ug Uh Ui Uj Uk Ul Um Un Uo Up Uq Ur Us Ut Uu Uv Uw Ux Uy Uz UA UB UC UD UE UF UG UH UI UJ UK UL UM UN UO UP UQ UR US UT UU UV UW UX UY UZ Letter-digit & Digit-letter combinations U0 U1 U2 U3 U4 U5 U6 U7 U8 U9 0U 1U 2U 3U 4U 5U 6U 7U 8U 9U

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