Y (disambiguation)

From Wikipedia, the free encyclopedia

Y is the twenty-fifth letter of the Latin alphabet. It also has the following meanings.

Contents 1 Science 2 Mathematics 3 Computing 4 Places 5 Other uses

[edit] Science

• In astronomy,
  • Y stands for an hypothetical ultra-cool brown dwarf class of stars.
  • Y stands for a December 16 through 31 discovery, in the provisional designation of a comet (e.g. C/1823 Y1, the Great Comet of 1823) or asteroid (e.g. (4324) 1981 YA₁).
• In biochemistry, Y is the symbol for tyrosine.
• In biology, Haplogroup Y (mtDNA) is a human mitochondrial DNA (mtDNA) haplogroup.
• In chemistry, Y is the symbol for yttrium.
• In color models,
  • Y stands for the color yellow in the CMYK color model.
  • Y stands for luminance in many color models used for television broadcast, such as YIQ and YUV.
• In electrical engineering, Y is the symbol for admittance, the inverse of impedance.
• In the SI system,
  • Y, yotta is the SI prefix meaning 10²⁴.
  • y, yocto is the SI prefix meaning 10^-24.
• In genetics Y denotes the Y chromosome.
  • In sex, XY denotes male in the XY sex-determination system.

[edit] Mathematics

• y commonly denotes the dependent variable.
• y is the usual symbol for the variable represented on the vertical axis (ordinate, or Y-axis) in analytic geometry.
• In combinatory logic, Y is the name of a well known fixed point combinator.

[edit] Computing

• Y Window System is a proposed development of the X Window System.
• In command line interpreters like 4DOS, y is a command to concatenate the output of two or more streams.
• In SketchUp, y is the green axis.
• In Internet slang and text messaging, Y (or y) often stands for why due to the similarity in pronunciation.

[edit] Places

• Y is the name of a place in Alaska; see Y, Alaska.
• Y is the name of a commune in the Somme département of France; see Y, Somme.
• As the first letter of a postal code, in Canada, Y stands for the Yukon.

[edit] Other uses

• In comic books, Y: The Last Man is the title of a DC comics series by Brian K. Vaughan.
• In economics, Y is used to represent income.
• In film, Y is the name of a 1987 Swedish film; see Y (film).
• In finance, Y is the U.S. ticker symbol for Alleghany Corporation.
• In games, Y is the name of a modern board game, played on a triangle-shaped board; see Y (game).
• In music, Y is the debut album by Bristol-based post-punk band The Pop Group.
• In scheduled air transport, Y is used to refer to economy class seating (first class is F).
• In sociology, Y refers to Generation Y.
• "The Y" is short for:
  • the YMCA, or sometimes the YWCA.
  • the YMHA or YWHA.
  • Brigham Young University (BYU) or the large "Y" made of stones on the mountain overlooking BYU.