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

ミサイル駆逐艦[misairukuchikukan] (guided) missile destroyer
伊艦[ikan] Italian warship
仮装巡洋艦[kasoujunyoukan] merchant cruiser
艦橋[kankyou] bridge (e.g. on a warship)
艦載機[kansaiki] ship-borne plane

艦上[kanjou] aboard a warship
艦船[kansen] (ocean) vessels
艦隊[kantai] (naval) fleet
艦長[kanchou] captain (of a warship)