black square button (U+1F532)

The emoji 🔲 is a gray, square button with rounded corners and a thin border. It is often used to represent a placeholder, a spot that needs to be filled in or completed. It can also be used to indicate a button or a selectable option in a digital interface. Additionally, it can be used in a similar way to the "crossing out" function, to indicate that something is not applicable or no longer relevant. Overall, 🔲 is a versatile emoji that can be used in a variety of contexts to convey the idea of a blank space or a selectable option.