U+25E9 "◩" Square with Upper Left Diagonal Half Black Unicode Character

U+25E9 "◩" Square with Upper Left Diagonal Half Black is a geometric symbol that depicts a square whose interior is bisected by a diagonal line running from the upper left corner to the lower right corner, with the upper left triangular half filled in black and the lower right half left empty or white. This character falls within the Geometric Shapes block of the Unicode standard and is commonly used in typography, user interface design, and data visualization to represent partial selection, incomplete states, or to create binary or contrast-based diagrams. Its distinct half filled appearance makes it useful for conveying concepts such as half filled levels, status indicators, or directional emphasis in both digital and printed contexts.