Undefined Character (U+11991)

Plane:	Supplementary Multilingual Plane, U+10000 - U+1FFFF^[1]
HTML Entity:	`𑦑` `𑦑`
UTF-8 Encoding:	`0xF0 0x91 0xA6 0x91`
UTF-16 Encoding:	`0xD806 0xDD91`
UTF-32 Encoding:	`0x00011991`

References