OBJECT REPLACEMENT CHARACTER
U+FFFC

Block
Specials
Category
Other Symbol
UTF-8
0xEF 0xBF 0xBC
UTF-16
0xFF 0xFE 0xFC 0xFF
UTF-32
0xFF 0xFE 0x0 0x0 0xFC 0xFF 0x0 0x0
HTML

Python
u"\uFFFC"