LEFT RIGHT DOUBLE ARROW U+21D4

BlockArrows
CategoryMath Symbol
UTF-80xE2 0x87 0x94
UTF-160xFF 0xFE 0xD4 0x21
UTF-320xFF 0xFE 0x0 0x0 0xD4 0x21 0x0 0x0
HTML⇔
Pythonu"\u21D4"