Undefined Character (U+138FF)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𓣿` `𓣿`
UTF-8 Encoding:	`0xF0 0x93 0xA3 0xBF`
UTF-16 Encoding:	`0xD80E 0xDCFF`
UTF-32 Encoding:	`0x000138FF`

References