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What the picture shows

A pixel-art cartoon character with big dark eyes, a red headband with a metal plate, and a dark high-collared top raises one hand in a wave while the word "BYE" in bold yellow-to-orange gradient letters sits above their head. Chatters most likely use this to say goodbye or signal that they are leaving the stream or conversation.

No measured meaning yet. Used 37 times in 1 channels this month; one is written once chat gives enough evidence.