U+1F18E "🆎" Negative Squared Ab Unicode Character

U+1F18E "🆎" Negative Squared Ab is a single character used as an ideographic symbol to represent AB blood type, which is the rarest and a universal recipient blood type. It is part of the Enclosed Alphanumeric Supplement block and features the letters "A" and "B" enclosed within a square, often displayed with a negative (white on dark) background. This character is commonly incorporated into digital text and interface designs, such as in medical applications, blood donation information, or user interface icons, to concisely and visually represent the AB blood group without requiring separate letters or formatting.