- Brahmi numeral
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.
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 IAST|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 hieraticand 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.
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 IAST| Kharoṣṭhīalphabet. 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.
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