Y, the twenty-fifth letter of the English alphabet, at the beginning of a word or syllable, except when a prefix (see Y-), is usually a fricative vocal consonant; as a prefix, and usually in the middle or at the end of a syllable, it is a vowel. See Guide to Pronunciation, §§ 145, 178-9, 272.

Something shaped like the letter Y; a forked piece resembling in form the letter Y.

One of the forked holders for supporting the telescope of a leveling instrument, or the axis of a theodolite; a wye.

Y is an abstract strategy game which was first described by Claude Shannon in the early 1950s. Y was independently reinvented around the same time by Craige Schensted (now Ea Ea) and Charles Titus. It is a member of the connection game family inhabited by Hex, Havannah, Twix T, and others; it is also an early member in a long line of games that Ea Ea has developed, each game more complex but also more generalised.

a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys

Y is a 1979 album by The Pop Group.

A portion of track consisting of two diverging tracks connected by a cross track.