As character names:

U+0331 COMBINING MACRON 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 177, hex 0xB1, octal \261, binary 10110001
This is continuation byte 1, expecting 0 more.

U+0331	COMBINING MACRON BELOW
	x (low line - 005F)
	x (modifier letter low macron - 02CD)