As character names:

U+03DA GREEK LETTER STIGMA character (Ϛ)

As raw characters:

Ϛ

As a string of HTML entities:

Ϛ

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 154, hex 0x9A, octal \232, binary 10011010
This is continuation byte 1, expecting 0 more.

U+03DA	GREEK LETTER STIGMA
	* apparently in origin a cursive form of digamma
	* the name "stigma" originally applied to a medieval sigma-tau ligature, whose shape was confusably similar to the cursive digamma
	* used as a symbol with a numeric value of 6
	x (roman numeral six late form - 2185)