As character names:

U+17D9 KHMER SIGN PHNAEK MUAN character (៙)

As raw characters:

៙

As a string of HTML entities:

៙

Decoder output:

Byte number 1 is decimal 225, hex 0xE1, octal \341, binary 11100001
This is the first byte of a 3 byte sequence.

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

Byte number 3 is decimal 153, hex 0x99, octal \231, binary 10011001
This is continuation byte 2, expecting 0 more.

U+17D9	KHMER SIGN PHNAEK MUAN
	* indicates the beginning of a book or a treatise
	* the preferred transliteration is phnek moan
	x (thai character fongman - 0E4F)