Triplet

A triplet is a set of three items. It may refer to:

Science

 * A series of three nucleotide bases forming an element of the Genetic code
 * J-coupling as part of Nuclear magnetic resonance spectroscopy
 * Opal in preparation to be a gemstone
 * Spin triplet in quantum mechanics, as in triplet oxygen, or triplet state in general
 * Tuple of length 3 in mathematics

Technologies

 * Photography triplet, or paint triplet
 * Triplet lens, an optical device consisting of three single lenses
 * Tandem bicycle, with three seats

Other uses

 * Triplets, the multiple birth of three children
 * Triplet Lakes, a group of lakes in Minnesota
 * The Triplets, a Spanish children's book
 * The Triplets (band), a Latin pop group
 * Binghamton Triplets, a minor league baseball team
 * A triplet, a kind of assembled gem
 * In music, a tuplet of three successive notes of equal duration
 * "The Triplets", Tyler Johnson, Ondrej Palat, and Nikita Kucherov of the 2014–15 Tampa Bay Lightning