While the decimal numbering system allows any digit in a number to have any of ten values (0-9), digits in hexadecimal numbers can have 16 (0-F), digits in octal numbers only eight (0-7) and ...

Table of Contents Log out of Google and search for [binary], [octal] and [hexadecimal] and you will see a little geeky easter egg. The easter egg shows the value of the results in that number systems.