Code point
U+2566
Glyph appearance depends on your fonts.
U+2566
SoU+2566 BOX DRAWINGS DOUBLE DOWN AND 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+2566
9574
╦
╦
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E2 95 A6
2566
00002566
%E2%95%A6
\u2566
\u2566
\u2566
\2566