Undefined Character (U+13EFF)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𓻿` `𓻿`
UTF-8 Encoding:	`0xF0 0x93 0xBB 0xBF`
UTF-16 Encoding:	`0xD80F 0xDEFF`
UTF-32 Encoding:	`0x00013EFF`

References