As character names:

U+03CF GREEK CAPITAL KAI SYMBOL character (Ϗ)

As raw characters:

Ϗ

As a string of HTML entities:

Ϗ

Decoder output:

Byte number 1 is decimal 207, hex 0xCF, octal \317, binary 11001111
This is the first byte of a 2 byte sequence.

Byte number 2 is decimal 143, hex 0x8F, octal \217, binary 10001111
This is continuation byte 1, expecting 0 more.

U+03CF	GREEK CAPITAL KAI SYMBOL
	x (greek kai symbol - 03D7)