THESAURUS
Shamrock
armory, badge, badge of office, badges, baton, blazonry, brassard, button, cap and gown, chain, chain of office, class ring, clover, cockade, collar, cross, decoration, deuce-ace, dress, eagle, emblems, ensigns, fasces, figurehead, fleur-de-lis, hammer and sickle, heraldry, insignia, lapel pin, leash, livery, mace, mantle, markings, medal, mortarboard, old school tie, pin, regalia, ring, rose, school ring, set of three, sigillography, skull and crossbones, sphragistics, staff, swastika, tartan, tercet, ternary, ternion, terzetto, thistle, three, threesome, tie, tierce, trefoil, trey, triad, trialogue, triangle, tricorn, trident, triennium, trihedron, trilogy, trimester, trine, trinity, trinomial, trio, triphthong, triple crown, triple threat, triplet, triplopy, tripod, triptych, trireme, triseme, triskelion, trisul, triumvirate, triunity, trivet, troika, uniform, verge, wand
ROGET THESAURUS
Shamrock
Triality
N
triality, trinity, triunity, three, triad, triplet, trey, trio, ternion, leash, shamrock, tierce, spike-team, trefoil, triangle, trident, triennium, trigon, trinomial, trionym, triplopia, tripod, trireme, triseme, triskele, triskelion, trisula, third power, cube, cube root, three, triform, trinal, trinomial, tertiary, ternary, triune, triarch, triadie, triple, tri-, tris-, tria juncta in uno.