However, because the Chinese character '箏' isn't included in the Joyo-kanji, '琴' and '箏' are sometimes used confusedly; for example, bridges (ji, '柱' in Chinese character) used for 'So (箏) no Koto' are called 'Koto-ji' (琴柱), and the person who teaches playing the instrument 'So (箏) no Koto' introduces oneself as 'a teacher of 'Kin (琴) no Koto' in advertisements and others.
ただし、「箏」の字が常用漢字で無いことから「箏のこと」で用いる柱を琴柱（ことじ）と言ったり、箏曲を教える人が広告などに「琴曲教授」と書いていたり、「琴」と「箏」は一部に混乱もみられる。