As character names:

U+25A8 SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL character (▨)

As raw characters:

▨

As a string of HTML entities:

▨

Decoder output:

Byte number 1 is decimal 226, hex 0xE2, octal \342, binary 11100010
This is the first byte of a 3 byte sequence.

Byte number 2 is decimal 150, hex 0x96, octal \226, binary 10010110
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 168, hex 0xA8, octal \250, binary 10101000
This is continuation byte 2, expecting 0 more.

U+25A8	SQUARE WITH UPPER RIGHT TO LOWER LEFT FILL
	x (upper right to lower left fill - 1FB99)