As character names:

U+222D TRIPLE INTEGRAL 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 136, hex 0x88, octal \210, binary 10001000
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 173, hex 0xAD, octal \255, binary 10101101
This is continuation byte 2, expecting 0 more.

U+222D	TRIPLE INTEGRAL
	x (quadruple integral operator - 2A0C)
	# 222B 222B 222B