5th note of the ancient chromatic scale (approx. F♯)
Technical term from traditional Japanese music theory (gagaku). Part of the 十二律 (jūniritsu) system; corresponds to 姑洗 (kosen).
In gagaku, shimomu is the fifth note of the twelve-tone scale.
The name 下無 (shimomu) is a native Japanese term for a specific pitch in the imported Chinese 十二律 system. The exact derivation of the name is uncertain.