Code point
U+2381
Glyph appearance depends on your fonts.
U+2381
SoU+2381 CONTINUOUS UNDERLINE SYMBOL is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Miscellaneous Technical block.
Choose the representation you need, then copy its value.
U+2381
9089
⎁
⎁
E2 8E 81
2381
00002381
%E2%8E%81
\u2381
\u2381
\u2381
\2381