The best replacement for triplet is singlet.

The best alternatives to triplet are rated as following:
★★★★★  singlet
★★★  codon
★★★  doublet
★★  tercet
★★  doublet refractor
★★  dotted eighth
★  singlet oxygen
★  doublet telescope
★  triplets
★  trimec
  doublet opal
  doublet telescopes
  twin

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No companions for triplet have been suggested so far.
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triplet
singlet
codon