The A button (blood type) emoji—a red disc featuring a white "A"—primarily signifies the A blood group, one of the main blood types classified under the ABO blood grouping system. In medical contexts, this symbol is used to indicate individuals whose red blood cells contain the A antigen. This is crucial for blood transfusions and organ transplants, as compatibility between donor and recipi...

The AB button (blood type) emoji is a symbol representing the AB blood type, one of the four main blood groups in the ABO blood group system. This emoji specifically features the letters "AB" enclosed in some sort of shape, typically a square or a circle depending on the platform being used. The AB blood type is unique in that it has both A and B antigens on the surface of the red blood cells b...