A simple black square button, often used for navigation.
Unicode: U+1F532
The black square button emoji represents a basic square button, commonly used in user interfaces or as a symbol for navigation. It can also signify a blank or empty space, or be used to represent the color black in various contexts.
"Click on the 🔲 button to proceed to the next step."
"There are three 🔲🔲🔲 boxes left to fill in the form."
"The new design features a sleek black 🔲 background."