black medium square (U+25FC)

The emoji you provided is a "heavy large circle" or "black large square." It is a solid, black, square-shaped symbol that is often used to represent a barrier, boundary, or obstacle in digital communication. It can also be used to indicate a "stop" or "full" status, such as in a progress bar or a loading symbol. Additionally, it can be used as a design element to add visual interest or to separate content in digital interfaces. This emoji is commonly found in digital communication platforms, such as messaging apps, social media sites, and email.