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| Numeral systems by culture | |
|---|---|
| Hindu-Arabic numerals | |
| Western Arabic Eastern Arabic Khmer |
Indian family Brahmi Thai |
| East Asian numerals | |
| Chinese Suzhou Counting rods |
Japanese Korean |
| Alphabetic numerals | |
| Abjad Armenian Cyrillic Ge'ez |
Hebrew Greek (Ionian) Āryabhaṭa |
| Other systems | |
| Attic Babylonian Egyptian English |
Etruscan Mayan Roman Urnfield |
| List of numeral system topics | |
| Positional systems by base | |
| Decimal (10) | |
| 2, 4, 8, 16, 32, 64 | |
| 1, 3, 9, 12, 20, 24, 30, 36, 60, more… | |
A Septemvigesimal numeral system has a base of twenty-seven.
Septemvigesimal notation can be used as a concise representation of ternary data, where each septemvigesimal digit represents three ternary digits. This is similar to using octal notation to represent binary data, though the digit set is closer in size to hexadecimal.
Examples: (Digits 10-26 are represented by letters A through Q.)
| Decimal | Ternary | Septemvigesimal |
|---|---|---|
| 0 | 000 | 0 |
| 1 | 001 | 1 |
| 2 | 002 | 2 |
| 3 | 010 | 3 |
| 5 | 012 | 5 |
| 10 | 101 | A |
| 15 | 120 | F |
| 20 | 202 | K |
| 25 | 221 | P |
| 26 | 222 | Q |
| 27 | 1000 | 10 |
| 81 | 10000 | 30 |
An alternate encoding, mapping 0 to space and 1-26 to A-Z, is occasionally used in puzzles to transform ternary triplets into words or messages.
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