ter·cet /ˈtɝsət/
  三行聯句,三連音,三拍子
  Ter·cet n.
  1. Mus. A triplet.
  2. Poetry A triplet; a group of three lines.
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  tercet
       n : the cardinal number that is the sum of one and one and one
           [syn: three, 3, III, trio, threesome, tierce,
            leash, troika, triad, trine, trinity, ternary,
            ternion, triplet, terzetto, trey, deuce-ace]