There are three general groups of musical instruments called 'Koto' in Japan: (1) 琴 (generally called 'Koto' or 'Kin'), (2) 箏 (generally called 'So') and (3) 和琴 (generally called 'Wagon').
日本で「こと」と呼ばれる楽器は（1）琴、（2）箏、（3）和琴（わごん）がある。