As character names:

U+2901 RIGHTWARDS TWO-HEADED ARROW WITH DOUBLE VERTICAL STROKE 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 164, hex 0xA4, octal \244, binary 10100100
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 129, hex 0x81, octal \201, binary 10000001
This is continuation byte 2, expecting 0 more.

U+2901	RIGHTWARDS TWO-HEADED ARROW WITH DOUBLE VERTICAL STROKE
	= z notation finite surjection
	x (leftwards two-headed arrow with double vertical stroke - 2B35)