LEFTWARDS ARROW OVER RIGHTWARDS ARROW U+21C6

BlockArrows
CategoryOther Symbol
UTF-80xE2 0x87 0x86
UTF-160xFF 0xFE 0xC6 0x21
UTF-320xFF 0xFE 0x0 0x0 0xC6 0x21 0x0 0x0
HTML⇆
Pythonu"\u21C6"