Code point
U+259B
Glyph appearance depends on your fonts.
U+259B
SoU+259B QUADRANT UPPER LEFT AND UPPER RIGHT AND LOWER LEFT is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Block Elements block.
Choose the representation you need, then copy its value.
U+259B
9627
▛
▛
E2 96 9B
259B
0000259B
%E2%96%9B
\u259B
\u259B
\u259B
\259B