| Numeral systems by culture |
| Hindu-Arabic numerals |
Western Arabic
Eastern Arabic
Khmer |
Indian family
Brahmi
Thai |
| East Asian numerals |
Chinese
Suzhou
Counting rods |
Japanese
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| Alphabetic numerals |
Abjad
Armenian
Cyrillic
Ge'ez |
Hebrew
Greek (Ionian)
Āryabhaṭa
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| Other systems |
Attic
Babylonian
Egyptian
Etruscan |
Mayan
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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… |
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The Brahmi numerals are an indigenous Indian numeral system attested from the 3rd century BCE (somewhat later in the case of most of the tens). They are the direct graphic ancestors of the modern Indic and Arabic numerals. However, they were conceptually distinct from these later systems, as they were not used as a positional system with a zero. Rather, there were separate numerals for each of the tens (10, 20, 30, etc.). There were also symbols for 100 and 1000 which were combined in ligatures with the units to signify 200, 300, 2000, 3000, etc.
Origins
The source of the first three numerals seems clear: they are collections of 1, 2, and 3 strokes, in Ashoka's era vertical I, II, III like Roman numerals, but soon becoming horizontal like the modern Chinese numerals. In the oldest inscriptions, 4 is a +, reminiscent of the X of neighboring Kharoṣṭhī, and perhaps a representation of 4 lines or 4 directions. However, the other unit numerals appear to be arbitrary symbols in even the oldest inscriptions. It is sometimes supposed that they may also have come from collections of strokes, run together in cursive writing in a way similar to that attested in the development of Egyptian hieratic and demotic numerals, but this is unsupported by any direct evidence. Likewise, the units for the tens are not obviously related to each other or to the units, although 10, 20, 80, 90 might be based on a circle.
Brahmi numerals in the first century CE
The sometimes rather striking graphic similarity they have with the hieratic and demotic Egyptian numerals is not good evidence of a historical connection, as many cultures have independently recorded numbers as collections of strokes. With a similar writing instrument, the cursive forms of such groups of strokes could easily be broadly similar as well, and this is one of the primary hypotheses for the origin of Brahmi numerals.
Another possibility is that the numerals were acrophonic, like the Attic numerals, and based on the Kharoṣṭhī alphabet. For instance, chatur 4 early on took a ¥ shape much like the Kharosthi letter ch; panca 5 looks remarkably like Kharosthi p; and so on through shat 6, sapta 7, and nava 9 (Kharosthi sh, s, n). However, there are problems of timing and lack of records. The full set of numerals is not attested until the 1st-2nd century CE, 400 years after Ashoka. Both suggestions, that the numerals derive from tallies or that they're alphabetic, are purely speculative at this point, with little evidence to decide between them.
See also
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