DOWNWARDS TWO HEADED ARROW U+21A1

BlockArrows
CategoryOther Symbol
UTF-80xE2 0x86 0xA1
UTF-160xFF 0xFE 0xA1 0x21
UTF-320xFF 0xFE 0x0 0x0 0xA1 0x21 0x0 0x0
HTML↡
Pythonu"\u21A1"