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

アーク灯[aakutou] arc light
灯影[hokage] firelight
懐中電灯[kaichuudentou] electric torch
外灯[gaitou] outside light
街灯[gaitou] street light

幻灯[gentou] slide projector
行灯[andon] fixed paper-enclosed lantern
信号灯[shingoutou] signal light
石灯籠[ishitourou] stone lantern
船灯[sentou] ship's lamp