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◼️ is a black square emoji. It can be used to represent a placeholder, for example, to represent a task item in a to - do list; it can also be used as a simple separation mark in some explanatory content.
Today's task list: Buy groceries ◼️ Pick up the express delivery.
Meeting arrangements: Start at 9 o'clock ◼️ Have a break at 11 o'clock.