It is a birthmark pose that can be used when underground idols are doing Yin Capiece in Yin Kya business.
If you adjust your arms and fingers a little, you can use it for air quotes (quoting gestures seen in Europe and the United States).
地下アイドルなどが陰キャ営業で陰キャピースしてくれている時に使える、あざとめのポーズです。
腕や指を少し調整すればエアクオート（欧米で見かける引用ジェスチャー）にも流用できそう。
▼ Related: Gachi Yin is here (Content ID: 2283497)
▼ Reference: It looks like this when lined up
▼関連：ガチ陰はこちら（コンテンツID：2283497）
▼参考：並べるとこんな感じ
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