LEFT SQUARE BRACKET WITH UNDERBAR U+298B

BlockMiscellaneous Mathematical Symbols-B
CategoryOpen Punctuation
UTF-80xE2 0xA6 0x8B
UTF-160xFF 0xFE 0x8B 0x29
UTF-320xFF 0xFE 0x0 0x0 0x8B 0x29 0x0 0x0
HTML⦋
Pythonu"\u298B"