[筝 / 箏, zhēngㄓㄥ] guzheng or long zither; long zither with 13 to 16 strings, developed from guqin 古琴 during Tang and Song times; Japanese koto, See Also: 古琴#40869
[古筝 / 古箏, gǔ zhēngㄍㄨˇ ㄓㄥ] zither or guzheng; large zither with 13 to 25 strings, developed from guqin 古琴 during Tang and Song times, See Also: 古琴#28525