binary numeration system
3.A term sometimes applied to a numeric representation in the binary numeration system(as contrasted, possibly, to binary coded decimal or some other represen tation using0-bits and1-bits).
4.the average number of binary digits needed to express one radix digit in a non-binary numeration system; on the average a number that can be expressed in N decimal digits takes 3.3N binary digits.
5.The binary numeration system is usually used to count numbers and to calculate in computers, while it is not used in other fields of mathematics.

