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The hand gesture went viral on TikTok after the murder of Sarah Everard.
A hand gesture that went viral on TikTok after the murder of Sarah Everard has helped save a missing 16-year-old in the US.
The teenager was spotted in a car placing her thumb over her palm and closing her fist.
A man was arrested after police were called.
The signal was shared in the early days of the pandemic to discretely warn of domestic violence.