Y, 25th letter of the alphabet alphabet [Gr. alpha-beta, like Eng. ABC], system of writing , theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics ). Few alphabets have achieved the ideal exactness.
..... Click the link for more information. . It was a Latin importation of the eastern Greek upsilon (see U U, 21st letter of the alphabet , corresponding to the Greek upsilon [Gr.,=u without the aspirate]. Until the late Middle Ages the capital was V, the minuscule u, no distinction being made between the consonantal and vocalic uses of the letter.
..... Click the link for more information. ), which was pronounced like ü; the Romans used it for Greek words. In English y mainly represents the semivowel occurring in words such as yet; the same semivowel is the second member of the diphthongs ā, ē, ī, and oi. The modern ignorant use of y in ye for the (as in "Ye Olde Shoppe") is based on a misreading of an old sign for th. In chemistry Y is the symbol for the element yttrium yttrium (ĭt`rēəm) [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.9059; m.p.
..... Click the link for more information. .

Y

(1) Refers to the brightness signal (luma) in the YUV color space. See YUV.

(2) An abbreviation of Yes, commonly used in conjunction with N for No; for example, a prompt may ask you: Do you want to overwrite the file: y/n?

(3) The symbol typically used for output of a combinational logic circuit. See combinational logic.

(electricity)

wye

(chemistry)

yttrium

1.		Y - General purpose language syntactically like RATFOR, semantically like C. Lacks structures and pointers. Used as a source language for Jack W. Davidson and Christopher W. Fraser's peephole optimiser which inspired GCC RTL and other optimisation ideas. ftp://ftp.cs.princeton.edu/pub/y+po.tar.Z. It is a copy of the original distribution from the University of Arizona during the early 80's, totally unsupported. ["The Y Programming Language", D.R. Hanson, SIGPLAN Notices 16(2):59-68 (Feb 1981)]. [Jack W. Davidson and Christopher W. Fraser, "The Design and Application of a Retargetable Peephole Optimiser", TOPLAS, Apr. 1980]. [Jack W. Davidson, "Simplifying Code Through Peephole Optimisation" Technical Report TR81-19, The University of Arizona, Tucson, AZ, 1981]. [Jack W. Davidson and Christopher W. Fraser, "Register Allocation and Exhaustive Peephole Optimisation" Software-Practice and Experience, Sep. 1984].
2.		Y - See fixed point combinator.

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