AB Button (blood Type) Emoji

The AB button (🆎) is the blood type AB emoji — the rarest ABO blood type, found in only ~3-5% of the world's population. In Japan's ketsuekigata personality system, Type AB people are the enigmas: a blend of Type A's analytical nature and Type B's creative spirit, producing someone who's seen as unpredictable, dual-natured, and hard to read. They're the "genius or weirdo" type — respected for originality but often misunderstood. AB-positive is the universal plasma donor (the inverse of O-negative's universal red blood cell donation). In social media, 🆎 is the least used of the blood type emojis — it doesn't double as a useful letter like 🅰️, 🅱️, or 🅾️ do. Its primary audience is Japanese personality culture, medical/blood donation content, and the rare Western user who knows what ketsuekigata means.

🆎 is the quietest of the blood type emojis. 🅱️ went viral as a meme. 🅰️ and 🅾️ double as letters and exclamations. 🆎 doesn't have a secondary use — it's blood type AB or nothing. That makes it niche but authentic: when someone uses 🆎, they almost certainly mean the blood type. In Japanese social media, Type AB people are sometimes called "eccentric geniuses" — a label that sounds flattering but often masks discrimination. AB types, along with B types, face the most bura-hara (blood type harassment) in Japan.

Type AB was the last ABO blood type to be discovered — identified in 1902 by Alfred von Decastello and Adriano Sturli, just one year after Landsteiner found A, B, and O. AB is also the newest blood type evolutionarily — it's believed to have emerged only about 1,000-1,200 years ago through the mixing of Type A and Type B populations. That makes it roughly the same age as the yin yang taijitu's swirling design. AB's rarity (3-5% globally, ~10% in Japan) gives it special status in both medicine and culture. Medically, AB-positive is the universal plasma donor — the mirror of O-negative's universal red blood cell donation. In ketsuekigata, AB's blend of A and B traits makes it the most complex and least understood type. Encoded at U+1F18E in Unicode 6.0 (2010).

Encoded in Unicode 6.0 (2010) as U+1F18E NEGATIVE SQUARED AB. Part of the Enclosed Alphanumeric Supplement block. Added to Emoji 1.0 in 2015.

In Japan, Type AB is the "misunderstood genius" — analytical like A, creative like B, but unpredictable and hard to categorize. AB and B types face the most bura-hara (blood type harassment). The rarity of AB in Japan (~10%) amplifies the "you're different" perception. Medically, AB-positive has a unique advantage: it's the universal plasma donor, meaning AB plasma can be given to any patient. This makes AB blood extremely valuable for plasma donation even though it's less useful for red blood cell transfusions. Famous Type AB people (according to ketsuekigata): Jackie Chan, Marilyn Monroe, and Barack Obama (though Western celebrities rarely confirm their blood types).

• •Type AB was discovered in 1902 by Decastello and Sturli, one year after Landsteiner found A, B, and O. It was the last ABO type identified.
• •AB is the evolutionary youngest blood type — only ~1,000-1,200 years old, created by mixing A and B populations.
• •Only 3-5% of the world's population is Type AB. In Japan it's ~10%, which is still the rarest type there.
• •AB-positive is the universal plasma donor — the inverse of O-negative's universal red blood cell donation.
• •In Japanese ketsuekigata, AB people are the 'enigmas' — respected for originality but often described as unpredictable and hard to understand.