As character names:

U+A840 PHAGS-PA LETTER KA character (ꡀ)

As raw characters:

ꡀ

As a string of HTML entities:

ꡀ

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 128, hex 0x80, octal \200, binary 10000000
This is continuation byte 3, expecting 0 more.

U+A840	PHAGS-PA LETTER KA
	* Mongolian, Chinese, Tibetan, Sanskrit
	x (tibetan letter ka - 0F40)