AB Button (Blood Type) 🆎

The AB button presents a red square with white letters "AB" displayed prominently, maintaining the same clean, badge-like aesthetic as its A and B counterparts. The dual-letter design sits centered and balanced within the colored field, making it instantly identifiable even at small sizes.

This emoji serves primarily as a medical indicator for AB blood type, the rarest blood type that can receive donations from all other types. It's used in health discussions, blood drive contexts, or when someone wants to quickly share their blood type with friends online. Like the A and B variants, it can also function as a creative label or organizational marker in creative messaging scenarios, though practical use remains relatively niche outside of medical settings.

The consistent red square design across platforms ensures clarity and recognition. Interestingly, in Japanese culture where these blood type emoji originated, AB blood type carries specific personality associations, making this symbol more culturally laden than it might initially appear to Western audiences. Understanding the cultural context helps explain why these specific emoji were among the earliest adopted.