As character names:

U+A861 PHAGS-PA LETTER O character (ꡡ)

As raw characters:

ꡡ

As a string of HTML entities:

ꡡ

Decoder output:

Byte number 1 is decimal 240, hex 0xF0, octal \360, binary 11110000
This is the first byte of a 4 byte sequence.

Byte number 2 is decimal 138, hex 0x8A, octal \212, binary 10001010
This is continuation byte 1, expecting 2 more.

Byte number 3 is decimal 161, hex 0xA1, octal \241, binary 10100001
This is continuation byte 2, expecting 1 more.

Byte number 4 is decimal 161, hex 0xA1, octal \241, binary 10100001
This is continuation byte 3, expecting 0 more.

U+A861	PHAGS-PA LETTER O
	x (tibetan vowel sign o - 0F7C)