RIGHTWARDS ARROW OVER LEFTWARDS ARROW
U+21C4
⇄
Block
Arrows
Category
Other Symbol
UTF-8
0xE2 0x87 0x84
UTF-16
0xFF 0xFE 0xC4 0x21
UTF-32
0xFF 0xFE 0x0 0x0 0xC4 0x21 0x0 0x0
HTML
⇄
Python
u"\u21C4"