Base 16. Note _hex_, six, and _decimal_, ten. In the Latin alphabet, uses all digits 0-9 and the letters A-F inclusive. Using sixteen symbols allows for conversion between the [[binary number|binary numbers]] from 0 to 15, which is all the numbers that can be expressed with four [[bit|bits]]. When converting from a [[binary number]] to [[hexadecimal|hex]], read left to right.