| Meaning | 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. |
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| Synonym | positional representation system |
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| Narrower | binary numeration system, pure binary numeration system, binary number system, binary system | A positional system of numeration that uses binary digits and a radix of two |
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| decimal numeration system, decimal number system, decimal system | A positional system of numeration that uses decimal digits and a base of ten |
| duodecimal number system, duodecimal system | A positional system of numeration that uses duodecimal digits and a radix of twelve |
| hexadecimal number system, sexadecimal number system, hexadecimal system | A positional system of numeration that uses hexadecimal digits and a radix of sixteen |
| octal numeration system, octal number system | A positional system of numeration that uses octal digits and a radix of eight |
| Broader | numeration system, number system, number representation system, system of numeration | Any notation for the representation of numbers |
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| Spanish | notación posicional |
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| Catalan | notació posicional |
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