ナンバーサインナンバーサインじ字FuriganaMeanings1nounnumber sign; hash sign; pound signRefers to the symbol #, used in contexts such as phone menus, social media hashtags, or numbering. In Japanese, it is often called シャープ (sharp) in music or 井桁 (igeta) for the shape, but ナンバーサイン is used for the symbol in computing/telephone contexts.電でん話わ番