Undefined Character (U+161DE)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𖇞` `𖇞`
UTF-8 Encoding:	`0xF0 0x96 0x87 0x9E`
UTF-16 Encoding:	`0xD818 0xDDDE`
UTF-32 Encoding:	`0x000161DE`

References