This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Brahmi belongs to a category of script called an abugida, sometimes also called a syllabic alphabet, which sits structurally between a full alphabet and a syllabary. In a true alphabet, consonants and vowels each get their own separate letter; in Brahmi, each basic consonant sign already carries a built-in, default vowel sound, and other vowels are indicated by adding small diacritic marks to that consonant sign rather than by writing a separate vowel letter. The efficiency of that system, compact, phonetically precise, and well suited to the sound patterns of Indian languages, is part of why it spread and adapted so widely across the subcontinent and beyond over the following two thousand years. Where Brahmi itself came from is genuinely disputed. Georg Buhler proposed in the nineteenth century that it derived from a Semitic script, likely Aramaic, carried into northwestern India through Achaemenid Persian administration; no scholar has since worked out a full, letter by letter derivation that would settle the question. Indigenous-origin theories point instead to possible local precursors, including graffiti marks that predate Ashoka's own edicts, and to the plain fact that Brahmi's letterforms do not closely resemble Aramaic's. More than a century after the debate began, no side has won it outright.