Undefined Character (U+FFFF)

Block:	Specials, U+FFF0 - U+FFFF^[1]
Plane:	Basic Multilingual Plane, U+0000 - U+FFFF^[1]
HTML Entity:	`` ``
UTF-8 Encoding:	`0xEF 0xBF 0xBF`
UTF-16 Encoding:	`0xFFFF`
UTF-32 Encoding:	`0x0000FFFF`

References