Code point
U+257F
Glyph appearance depends on your fonts.
U+257F
SoU+257F BOX DRAWINGS HEAVY UP AND LIGHT DOWN 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+257F
9599
╿
╿
E2 95 BF
257F
0000257F
%E2%95%BF
\u257F
\u257F
\u257F
\257F