As character names:

U+03D9 GREEK SMALL LETTER ARCHAIC KOPPA character (ϙ)

As raw characters:

ϙ

As a string of HTML entities:

ϙ

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 153, hex 0x99, octal \231, binary 10011001
This is continuation byte 1, expecting 0 more.

U+03D9	GREEK SMALL LETTER ARCHAIC KOPPA
	* the Q-shaped archaic koppas are the ordinary alphabetic letters and can also be used as symbols with a numeric value of 90 in classical and pre-classical texts