Code point
U+2501
Glyph appearance depends on your fonts.
U+2501
SoU+2501 BOX DRAWINGS HEAVY HORIZONTAL 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+2501
9473
━
━
E2 94 81
2501
00002501
%E2%94%81
\u2501
\u2501
\u2501
\2501