Ninja was also called as ' Shinobi'
Shamisen's mute bridge is called Sinobi Koma.
It's because Shinobi Koma is the bridge which is used by Ninja to assasinate people.
Just kidding.
For more information,
The phonto right is the folk art in Iwate Prefecture, horse doll made by straw is also called 'Shinobi Koma'.That's a coincience.
練習用に三味線の音を小さくする駒を忍び駒
といいますが、
これは 昔 忍び（忍者）が大名を暗殺する為に
忍び駒を使っていたからだそうです。
何てウソぴょーん
ちなみに岩手県に伝わる 藁で作った 馬も、
偶然なのか「忍び駒」と言います。
