As character names:

U+03FF GREEK CAPITAL REVERSED DOTTED LUNATE SIGMA SYMBOL character (Ͽ)

As raw characters:

Ͽ

As a string of HTML entities:

Ͽ

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 191, hex 0xBF, octal \277, binary 10111111
This is continuation byte 1, expecting 0 more.

U+03FF	GREEK CAPITAL REVERSED DOTTED LUNATE SIGMA SYMBOL
	= antisigma periestigmenon