As character names:

U+03DF GREEK SMALL LETTER KOPPA character (ϟ)

As raw characters:

ϟ

As a string of HTML entities:

ϟ

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 159, hex 0x9F, octal \237, binary 10011111
This is continuation byte 1, expecting 0 more.

U+03DF	GREEK SMALL LETTER KOPPA
	* used in modern Greek as a symbol with a numeric value of 90, as in the dating of legal documentation