As character names:

U+2049 EXCLAMATION QUESTION MARK character (⁉)

As raw characters:

⁉

As a string of HTML entities:

⁉

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 129, hex 0x81, octal \201, binary 10000001
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 137, hex 0x89, octal \211, binary 10001001
This is continuation byte 2, expecting 0 more.

U+2049	EXCLAMATION QUESTION MARK
	# 0021 003F