Code point
U+2531
Glyph appearance depends on your fonts.
U+2531
SoU+2531 BOX DRAWINGS RIGHT LIGHT AND LEFT DOWN HEAVY is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Box Drawing block.
Choose the representation you need, then copy its value.
U+2531
9521
┱
┱
E2 94 B1
2531
00002531
%E2%94%B1
\u2531
\u2531
\u2531
\2531