SQUARE WITH LOWER LEFT DIAGONAL HALF BLACK U+2B15

BlockMiscellaneous Symbols and Arrows
CategoryOther Symbol
UTF-80xE2 0xAC 0x95
UTF-160xFF 0xFE 0x15 0x2B
UTF-320xFF 0xFE 0x0 0x0 0x15 0x2B 0x0 0x0
HTML⬕
Pythonu"\u2B15"