As character names:

U+03BE GREEK SMALL LETTER XI character (ξ)

As raw characters:

ξ

As a string of HTML entities:

ξ

Decoder output:

Byte number 1 is decimal 206, hex 0xCE, octal \316, binary 11001110
This is the first byte of a 2 byte sequence.

Byte number 2 is decimal 190, hex 0xBE, octal \276, binary 10111110
This is continuation byte 1, expecting 0 more.

U+03BE	GREEK SMALL LETTER XI