U+1F17E U+FE0F "🅾️" O Button (Blood Type) Emoji

The "U+1F17E U+FE0F "🅾️" O Button (Blood Type)" emoji is a red square with a white letter O inside, approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015. It commonly represents the O blood type in medical or donation contexts, but it also functions as a general symbol for the letter O, a grade or score, or the number zero. In Japan, it often indicates "correct" or "good," similar to a checkmark. Because of its bright red color, it can also signal a warning, stop, or negative status in some interfaces.

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