Base 13, Numerals

Base-13, tridecimal, or tredecimal is a positional numeral system with thirteen as its base. It uses 13 different digits for representing numbers. Suitable digits for base 13 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, X, E and T (similar to base 12) or 0-9, A, B and C (similar to base 16). Base 13 is not used in any practical situation. Read more >>

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Positional systems

Binary
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Ternary
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Quaternary
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Quinary
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Senary
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Septenary
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Octal
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Nonary
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Decimal
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Undecimal
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Duodecimal
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Base 13
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Hexadecimal
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Vigesimal
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Numeral systems

Arabic numerals
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Roman numerals
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Languages

English
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German
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Spanish
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Swedish
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A numeral is a symbol or group of symbols that represents a number. Numerals differ from numbers just as words differ from the things they refer to. The symbols "11", "eleven" and "XI" are different numerals, all representing the same number. This article attempts to explain the various systems of numerals. Read more >>