As character names:

U+2BD1 UNCERTAINTY SIGN 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 175, hex 0xAF, octal \257, binary 10101111
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+2BD1	UNCERTAINTY SIGN
	= query
	x (apl functional symbol quad question - 2370)
	x (replacement character - FFFD)