They often display only a single hiragana , kanji ideograph , or katakana character carved in it .
Most Japanese also have a far less formal seal used to sign personal letters or initial changes in documents ; this is referred to by the broadly generic term hanko .
Japanese often display only a single hiragana , kanji ideograph , or katakana character carved in it .
Most Japanese also have a far less formal seal used to sign personal letters or initial changes in documents ; this is referred to by the broadly generic term hanko .