Black Medium-Small Square
A medium-small-sized square shaded completely black. Smaller than the ⬛ Black Large Square and ◾ Black Medium-Small Square but larger than the ▪️ Black Small Square.
Black Medium-Small Square was approved as part of Unicode 3.2 in 2002 under the name "Black Medium Small Square" and added to Emoji 1.0 in 2015.