noun
stone marker for hundred-times worship
A stone placed at temples or shrines, used as a marker for the practice of 百度参り (hyakudo-mairi), where worshippers walk back and forth a hundred times while praying.
See also: 百度参り (ひゃくどまいり)
お寺の境内に百度石が立っている。
A hyakudo-ishi stands in the temple grounds.
百度石の周りを百度回ると願いが叶うと言われている。
It is said that if you walk around the hyakudo-ishi a hundred times, your wish will come true.