trip·let 
/ˈtrɪplət/ noun
plural trip·lets /ˈtrɪplət/ noun [count] 1 : one of three babies that are born at the same time to the same mother — usually plural ▪ She had triplets. [=she gave birth to three babies] — compare quadruplet, quintuplet, sextuplet, twin 2 : a combination, set, or group of three things
▪ a triplet of colors
▪ a triplet of colors
