The Hakurei Yin-Yang Orbs (陰陽玉, In'yō-dama) are orbs with the appearance of the Yin-Yang symbol. They appear next to Reimu Hakurei in several games and are used in many of her attacks, either as danmaku or as part of her Spell Card. Based on the Prologue to Highly Responsive to Prayers, it seems that the orbs are a weapon belonging to the Hakurei Shrine. Reimu seems to be only the latest person to wield this weapon, "the Hakurei Shrine's greatest treasure." Originally, they were her only real means of damaging enemies. Additionally,

The Yin-Yang Orbs in the Game

according to Mima, only a bloodline member of the Hakurei clan c

Ying Yang Orbs in Mystic Square

an properly use the orbs. Since Reimu is the only known living member of her clan in Gensokyo, she's the only one that can use them.

In Story of Eastern Wonderland, depending on which ending the player gets, Genjii will explain the orb's "true power", each of which is hilariously mundane and are never spoken of again.

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