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▪️ It is an emoji in the shape of a small black square. It can usually be used to represent marking, place - holding, or to distinguish different parts in some charts, document - editing and other scenarios. It can also be used to represent some undetermined content areas that need to be noted.
There are some important contents in my document marked with ▪️.
On this design draft, some areas are covered with ▪️, indicating to be determined.