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⬛ is a black square emoji. It can be used to represent various things and is commonly used in design, marking or symbolizing some simple graphic concepts. For example, in graphic combinations, it may be part of a certain pattern; in some marking scenarios, it can be used to represent specific areas or classifications, etc.
I used ⬛ when designing the pattern.
I used ⬛ to mark a certain area in this form.