Information Representation
Number Base

We are used to dealing with numbers in the decimal system, where we use a base of 10, counting up from 0 to 9 and then resetting our number to 0 and carrying 1 into another column.This is probably a result of having ten fingers.

The alien shown here has only eight fingers, so it would most probably work in base 8, counting from 0 up to 7 and then resetting to 0 and carrying 1. So the number 10 in this system would mean 8 in the decimal system. Confusing isn't it? Base 8 is called the Octal system.