As character names:

U+2791 DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT EIGHT character (➑)

As raw characters:

➑

As a string of HTML entities:

➑

Decoder output:

Byte number 1 is decimal 226, hex 0xE2, octal \342, binary 11100010
This is the first byte of a 3 byte sequence.

Byte number 2 is decimal 158, hex 0x9E, octal \236, binary 10011110
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 145, hex 0x91, octal \221, binary 10010001
This is continuation byte 2, expecting 0 more.

U+2791	DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT EIGHT