Undefined Character (U+1FFF)

Block:	Greek Extended, U+1F00 - U+1FFF^[1]
Plane:	Basic Multilingual Plane, U+0000 - U+FFFF^[1]
HTML Entity:	`῿` `῿`
UTF-8 Encoding:	`0xE1 0xBF 0xBF`
UTF-16 Encoding:	`0x1FFF`
UTF-32 Encoding:	`0x00001FFF`

References