As character names:

U+221F RIGHT ANGLE 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 159, hex 0x9F, octal \237, binary 10011111
This is continuation byte 2, expecting 0 more.

U+221F	RIGHT ANGLE
	= with (in chess notation)
	x (reversed right angle - 2BFE)