As character names:

U+03C7 GREEK SMALL LETTER CHI character (χ)

As raw characters:

χ

As a string of HTML entities:

χ

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 135, hex 0x87, octal \207, binary 10000111
This is continuation byte 1, expecting 0 more.

U+03C7	GREEK SMALL LETTER CHI
	x (latin small letter chi - AB53)