It is a pose where you point with your thumb on the back. 後ろを親指で指すポーズです。
I used it in the form of pointing pointing. 
2025/11/24 Around 19:00 Public update with pose material
2025/11/24 Around 19:00 Public update with pose materialくいっと指差す形で使いました。2025/11/24 19:00頃 ポーズ素材で公開アップデート
2025/11/24 19:00頃 ポーズ素材で公開アップデートOld version
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