This white square button emoji depicts a gray or black square inside a bigger white one. This symbol is used when we are talking about squares, geometry, and refers to the absence of shapes as the square is outlined and not filled.
NOTE: White Square Button was accepted in 2010 as part of Unicode 6.0 and in 2015 labeled as Emoji 1.0.
🔳 White Square Button
:white_square_button: (Github, Slack)