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 (heavy exclamation mark ornament - 2762)
	U+0021, character !‬, decimal 33, hex 0x21, octal \041, binary 00100001
	UTF-8: 0x21

003F	QUESTION MARK
	x (inverted question mark - 00BF)
	x (greek question mark - 037E)
	x (arabic question mark - 061F)
	x (interrobang - 203D)
	x (question exclamation mark - 2048)
	x (exclamation question mark - 2049)
	U+003F, character ?‬, decimal 63, hex 0x3F, octal \077, binary 00111111
	UTF-8: 0x3f

203D	INTERROBANG
	x (exclamation mark - 0021)
	x (question mark - 003F)
	U+203D, character ‽‬, decimal 8253, hex 0x203D, octal \20075, binary 10000000111101
	UTF-8: 0xe2 0x80 0xbd