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

三菱[mitsubishi] Mitsubishi (company)
菱形[hishigata] diamond shape
菱餅[hishimochi] rhombus-shaped mochi
花菱[hanabishi] flower-shaped family crest
鉄菱[tetsubishi] caltrop

花菱草[hanabishisou] California poppy
撒菱[makibishi] caltrop (spiked device scattered to maim infantry and horses)
三菱電機[mitsubishidenki] Mitsubishi Electric
三菱商事[mitsubishishouji] Mitsubishi Corporation
赤菱[akabishi] Red Crystal (politically and religiously neutral emblem used by the International Committee of the Red Cross)