O Button (Blood Type) 🅾
Copy & Meaning

An O blood type button — representing the O blood type, the most common blood type worldwide and the 'universal donor' for red blood cells. Type O negative can be transfused to patients of any blood type in emergencies, making O negative donors particularly valuable to blood banks.

In Japanese blood type personality theory, O types are described as optimistic, social, flexible, and natural leaders. Used for blood type discussions, blood donation advocacy (particularly for the valuable O negative blood type), medical transfusion compatibility contexts, Japanese blood type personality discussions, and any situation where the O blood type specifically needs visual representation.