black square button

🔲 is a black square frame emoji. It can be used to represent a box to be ticked. For example, in a to - do list, there may be a 🔲 in front of each task, and when the task is completed, it can be marked as a completed state (such as ✔); it can also be used to represent an area that needs to be filled with content, such as an empty item in a form can use 🔲 to indicate that this is a place where information needs to be filled.