O Button (Blood Type) emoji

What does the 🅾️ o button (blood type) emoji mean?

The O button is a red square with a bold letter O, marking blood type O. It means the universal donor and the letter O.

Online it also stands in for the letter O in stylized text, a clean red badge of a letter.

How people use 🅾️

• Blood type O 🅾️
• Universal donor 🅾️
• Big fat zero 🅾️
• Letter O 🅾️

See it in a secret message

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