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

三椏[mitsumata] Oriental paper bush (Edgeworthia chrysantha)

三椏紙[mitsumatagami] var. of Japanese paper made from the Oriental paper bush

インディア紙[indiakami] India paper
クラフト紙[kurafutoshi] craft paper
ケント紙[kentoshi] Kent paper
リトマス試験紙[ritomasushikenshi] litmus paper
一紙半銭[isshihansen] small sum

陰画紙[ingashi] (photographic) printing paper
印刷紙[insatsushi] printing paper
印紙[inshi] (revenue) stamp
烏紙[karasugami] coarse dark-brown paper
黄表紙[kibyoushi] illustrated storybook with yellow covers (Edo period)