Code point
U+29CF
Glyph appearance depends on your fonts.
U+29CF
SmU+29CF LEFT TRIANGLE BESIDE VERTICAL BAR is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Miscellaneous Mathematical Symbols-B block.
Choose the representation you need, then copy its value.
U+29CF
10703
⧏
⧏
⧏
E2 A7 8F
29CF
000029CF
%E2%A7%8F
\u29CF
\u29CF
\u29CF
\29CF