Undefined Character (U+137FF)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𓟿` `𓟿`
UTF-8 Encoding:	`0xF0 0x93 0x9F 0xBF`
UTF-16 Encoding:	`0xD80D 0xDFFF`
UTF-32 Encoding:	`0x000137FF`

References