Triplet

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

one of three babies in a multiple birth
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.

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