As character names:

U+03D1 GREEK THETA SYMBOL character (ϑ)

As raw characters:

ϑ

As a string of HTML entities:

ϑ

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 145, hex 0x91, octal \221, binary 10010001
This is continuation byte 1, expecting 0 more.

U+03D1	GREEK THETA SYMBOL
	= script theta
	* used as a technical symbol
	# 03B8 greek small letter theta