Undefined Character (U+1FFEF)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`🿯` `🿯`
UTF-8 Encoding:	`0xF0 0x9F 0xBF 0xAF`
UTF-16 Encoding:	`0xD83F 0xDFEF`
UTF-32 Encoding:	`0x0001FFEF`

References