As character names:

U+259F QUADRANT UPPER RIGHT AND LOWER LEFT AND LOWER RIGHT 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 159, hex 0x9F, octal \237, binary 10011111
This is continuation byte 2, expecting 0 more.

U+259F	QUADRANT UPPER RIGHT AND LOWER LEFT AND LOWER RIGHT