Binary number system and Positional notation

Binary number system noun - A positional system of numeration that uses binary digits and a radix of two.

Positional notation and binary number system are semantically related. In some cases you can use "Positional notation" instead a noun phrase "Binary number system".

Positional notation noun - A numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position.

Binary number system and positional notation are semantically related. Sometimes you can replace phrase "Binary number system" with "Positional notation", this phrases are similar.