TRIPLET

A 'triplet' is a set of three items, and includes in particular:

★ one of three babies in a multiple birth

★ in lapidary, a preparation of opal as a gemstone, with a thin layer of opal backed with a dark material and covered with cap of clear quartz

★ in optics a compound lens which is made from three components in proximity to each other (or fastened together)

★ in poetry, a tercet (three lines) with a common rhyme

★ in music, a tuplet with a duration two-thirds (2/3) the regular note value duration in simple and/or duple meter. An irrational rhythm, it may also be used as a polyrhythm when played against the regular duration. In relation to triple time duple meter rhythms would be duples.

★ in genetics, three nucleotide pairs that form a codon

★ in quantum mechanics, a spin triplet is a set of three quantum states of a system, each with total spin $S=1$. The system could consist of a single elementary spin 1 particle such as the W or Z bosons, or be a multiparticle state built out of arbitrary other spin states with total spin one.

★ in mathematics, a triplet is a tuple of length 3.

★ a tandem bicycle with three seats

★ in photography or paint art, a triplet is a set of three photos.

★ in the NFL, "The Triplets" referred to Troy Aikman, Emmitt Smith, and Michael Irvin from 1990-1999 (phrase initially coined by then-coach Barry Switzer in 1996); Peyton Manning, Marvin Harrison, and Edgerrin James from 1999-2006 were also referred to by this title.

★ in baseball, the Binghamton Triplets were a minor league baseball team.

★ The Kercher Triplets: www.kerchertriplets.com