As character names:

U+01DF LATIN SMALL LETTER A WITH DIAERESIS AND MACRON character (ǟ)

As raw characters:

ǟ

As a string of HTML entities:

ǟ

Decoder output:

Byte number 1 is decimal 199, hex 0xC7, octal \307, binary 11000111
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+01DF	LATIN SMALL LETTER A WITH DIAERESIS AND MACRON
	* Livonian, Uralicist usage
	: 00E4 0304