three people on the same vehicle (usu. bike)
each of the three being different from the other two; each of the three having his (her) own way
three heads are better than two; (lit.) if three people gather; the wisdom of Manjushri
three women make a market; many women many words; (lit.) three women gathering creates a racket
ménage à trois; three-way sexual relationship
two is a company, three is a crowd; one companion is better than two