As character names:

U+2238 DOT MINUS 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 184, hex 0xB8, octal \270, binary 10111000
This is continuation byte 2, expecting 0 more.

U+2238	DOT MINUS
	= saturating subtraction
	* sometimes claimed as notation for symmetric set difference, but 2206 is preferred