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The base-20 notational system for representing Real Numbers. The digits used to represent numbers using vigesimal Notation are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, and J. A base-20 number system was used by the Aztecs and Mayans. The Mayans compiled extensive observations of planetary positions in base-20 notation.
See also Base (Number), Binary, Decimal, Hexadecimal, Octal, Quaternary, Ternary
References
Weisstein, E. W. ``Bases.'' Mathematica notebook Bases.m.