U+259E "▞" Quadrant Upper Right and Lower Left Unicode Character

U+259E "▞" Quadrant Upper Right and Lower Left is a block element that fills only the upper right and lower left quarters of its character cell, leaving the remaining two quadrants (upper left and lower right) empty. Part of the Block Elements range in Unicode, it is commonly used in text-based graphics and terminal applications to create half-shaded squares or to compose denser pixel patterns when combined with other quadrant characters. Representing one specific combination of the four available quadrants, this symbol provides a simple visual shorthand for representing partial shading or directional fills in low-resolution grid displays.