Save Gender Masculine Usage Japanese (Rare) Scripts 律信, 律 延, 立信, etc.(Japanese Kanji) Pronounced Pron. REE-TSOO-NO-BOO [key] Meaning & History From 律 (ritsu) meaning "law, ratio", 栗 (ritsu) meaning "chestnut", or 立 (ritsu) meaning "erect, rise, set up, stand" combined with 信 (nobu) meaning "trust", 延 (nobu) meaning "prolong, stretch". Other kanji are possible.