As character names:

U+2354 APL FUNCTIONAL SYMBOL QUAD DEL 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 141, hex 0x8D, octal \215, binary 10001101
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 148, hex 0x94, octal \224, binary 10010100
This is continuation byte 2, expecting 0 more.

U+2354	APL FUNCTIONAL SYMBOL QUAD DEL