Triplets

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In music,

• a regular (part of a) beat made of three parts

In knowledge bases

• semantic triplets, e.g. in RDF

In linguistics

• etymological triplets (rather than just twins)
• minimal triplets, an extension of the idea of minimal pairs
• sometimes a reference to n-grams for n=3 (3-grams)

In math and programming, sometimes a reference to a 3-tuple, e.g. as in "rgb triplet"