About QUADRANT UPPER RIGHT AND LOWER LEFT AND LOWER RIGHT
Quadrant Upper Right And Lower Left And Lower Right (U+259F) is a Unicode other symbol from the Block Elements block. It resides on Plane 0 (BMP, Basic Multilingual Plane), has bidirectional class ON (other neutrals), is not mirrored, and has combining class 0 (Not Reordered). In HTML it can be written as ▟ or ▟.