Triad
set of three entities
thesis, antithesis, synthesis
golden triangle
triple deity
Three Holy Mountains
Les trois lycées de la montagne
threesome
hat-trick
CIA triad
Three Pilgrimage Festivals
trio
codon
trinomial
triple bond
Three Jewels
triatomic molecule
Three Great Spears of Japan
trigram
Imperial Regalia of Japan
triple deity
semantic triple
Döbereiner's triads
Newton's laws of motion
New Three Imperial Treasures
SKY
Holy Family
triad
gross, net, and tare
triad