Positional notation and Sexadecimal 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.

Sexadecimal number system and positional notation are semantically related. In some cases you can replace phrase "Sexadecimal number system" with "Positional notation", this phrases are similar.

Sexadecimal number system noun - A positional system of numeration that uses hexadecimal digits and a radix of sixteen.

Positional notation and sexadecimal number system are semantically related. You can use "Positional notation" instead a noun phrase "Sexadecimal number system".