As character names:

U+031F COMBINING PLUS SIGN BELOW character (̟)

As raw characters:

̟

As a string of HTML entities:

̟

Decoder output:

Byte number 1 is decimal 204, hex 0xCC, octal \314, binary 11001100
This is the first byte of a 2 byte sequence.

Byte number 2 is decimal 159, hex 0x9F, octal \237, binary 10011111
This is continuation byte 1, expecting 0 more.

U+031F	COMBINING PLUS SIGN BELOW
	* IPA: advanced or fronted articulation
	x (modifier letter plus sign - 02D6)