Undefined Character (U+EFFFF)

Plane:	Supplementary Special-purpose Plane, U+E0000 - U+EFFFF^[1]
HTML Entity:	`󯿿` `󯿿`
UTF-8 Encoding:	`0xF3 0xAF 0xBF 0xBF`
UTF-16 Encoding:	`0xDB7F 0xDFFF`
UTF-32 Encoding:	`0x000EFFFF`

References