As character names:

U+25FB WHITE MEDIUM SQUARE 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 151, hex 0x97, octal \227, binary 10010111
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 187, hex 0xBB, octal \273, binary 10111011
This is continuation byte 2, expecting 0 more.

U+25FB	WHITE MEDIUM SQUARE
	= always (modal operator)
	x (white square - 25A1)
	x (white square with leftwards tick - 27E4)