Undefined Character (U+1423F)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𔈿` `𔈿`
UTF-8 Encoding:	`0xF0 0x94 0x88 0xBF`
UTF-16 Encoding:	`0xD810 0xDE3F`
UTF-32 Encoding:	`0x0001423F`

References