Undefined Character (U+1E691)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𞚑` `𞚑`
UTF-8 Encoding:	`0xF0 0x9E 0x9A 0x91`
UTF-16 Encoding:	`0xD839 0xDE91`
UTF-32 Encoding:	`0x0001E691`

References