As character names:

U+A877 PHAGS-PA MARK DOUBLE SHAD character (꡷)

As raw characters:

꡷

As a string of HTML entities:

꡷

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 183, hex 0xB7, octal \267, binary 10110111
This is continuation byte 3, expecting 0 more.

U+A877	PHAGS-PA MARK DOUBLE SHAD
	* Tibetan
	x (tibetan mark nyis shad - 0F0E)