Negative Squared Latin Capital Letter O (Apple)

The O blood type emoji, as rendered on Apple devices, features a clean, circular white button with a bold, dark red 'O' clearly inscribed within, all presented with Apple’s signature glossy 3D shading and soft, rounded edges. Realistic lighting gives the button a subtle depth and a polished feel, making it easily identifiable and professional. This emoji is a straightforward way to communicate one’s blood type in medical contexts or discussions related to health and donation on Apple.