御三時[osanji] three-o'clock snack
三鞭酒[shanpen] champagne
球面三角法[kyuumensankakuhou] spherical trigonometry
胸三寸[munesanzun] heart
元三[ganzan] New Year's period (January 1st to 3rd)

五十三次[gojuusantsugi] the 53 Toukaidou stages
向こう三軒[mukousangen] one's next three neighbors
降三世明王[gouzanzemyouou] Trailokyavijaya Vidya-raja
再三[saisan] again and again
再三再四[saisansaishi] repeatedly

右から左へ[migikarahidarihe] from right to left
右といえば左[migitoiebahidari] always contradicting what other people say
右往左往[uousaou] move about in confusion
左右[sayuu] left and right
左下[hidarishita] lower left

左回り[hidarimawari] counterclockwise rotation
左官[sakan] plasterer
左岸[sagan] left bank (of a river)
左記[saki] undermentioned (statement)