Code point
U+2550
Glyph appearance depends on your fonts.
U+2550
SoU+2550 BOX DRAWINGS DOUBLE 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+2550
9552
═
═
═
E2 95 90
2550
00002550
%E2%95%90
\u2550
\u2550
\u2550
\2550