yin yang orb
An orb with the appearance of a yin yang sign.
Yin yang orbs are commonly associated with Hakurei Reimu of Touhou, since they are one of her main weapons, but they're not exclusive to Touhou. They were apparently constructed by the craftsman goddess Tamatsukuri Misumaru in the distant past.
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This tag implicates orb and yin_yang (learn more).