Code point
U+251B
Glyph appearance depends on your fonts.
U+251B
SoU+251B BOX DRAWINGS HEAVY UP AND LEFT 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+251B
9499
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E2 94 9B
251B
0000251B
%E2%94%9B
\u251B
\u251B
\u251B
\251B