LEFT SQUARE BRACKET WITH TICK IN BOTTOM CORNER U+298F

BlockMiscellaneous Mathematical Symbols-B
CategoryOpen Punctuation
UTF-80xE2 0xA6 0x8F
UTF-160xFF 0xFE 0x8F 0x29
UTF-320xFF 0xFE 0x0 0x0 0x8F 0x29 0x0 0x0
HTML⦏
Pythonu"\u298F"