troi·ka /ˈtrɔɪkə/
  三頭馬車; 三人執政; (行政當局)三巨頭, 三人統治小組
  troika
       n 1: a Russian carriage pulled by three horses abreast
       2: the cardinal number that is the sum of one and one and one
          [syn: three, 3, III, trio, threesome, tierce,
          leash, triad, trine, trinity, ternary, ternion,
           triplet, tercet, terzetto, trey, deuce-ace]
       3: a modern Russian triumvirate