As character names:

U+0021 EXCLAMATION MARK character (!)

As raw characters:

!

As a string of HTML entities:

!

Decoder output:

Byte number 1 is decimal 33, hex 0x21, octal \041, binary 00100001

U+0021	EXCLAMATION MARK
	= factorial
	= bang
	x (inverted exclamation mark - 00A1)
	x (latin letter retroflex click - 01C3)
	x (double exclamation mark - 203C)
	x (interrobang - 203D)
	x (warning sign - 26A0)
	x (heavy exclamation mark symbol - 2757)
	x (heavy exclamation mark ornament - 2762)
	x (medieval exclamation mark - 2E53)
	x (modifier letter raised exclamation mark - A71D)