As character names:

U+2990 RIGHT SQUARE BRACKET WITH TICK IN TOP CORNER 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 166, hex 0xA6, octal \246, binary 10100110
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 144, hex 0x90, octal \220, binary 10010000
This is continuation byte 2, expecting 0 more.

U+2990	RIGHT SQUARE BRACKET WITH TICK IN TOP CORNER