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The ⬜ emoji usually represents a white square. It can be used in a variety of situations. For example, it can represent a blank area in some simple chart - drawing, or serve as a placeholder in a to - do list to mark items that are not yet completed or are waiting to be processed. In some simple design and layout representations, this white square is also used to construct structures or distinguish different areas, etc.
Today's task list: buy groceries ⬜ clean the room.
Meeting arrangements: report work in the morning ⬜ discuss the plan in the afternoon.