U+1104C Brahmi Punctuation Crescent Bar

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Brahmi ( BRAH-mee; 𑀩𑁆𑀭𑀸𑀳𑁆𑀫𑀻; ISO: Brāhmī) is a writing system from ancient India that appeared as a fully developed script in the 3rd century BCE. Its descendants, the Brahmic scripts, continue to be used today across South and Southeastern Asia.

Brahmi is an abugida and uses a system of diacritical marks to associate vowels with consonant symbols. The writing system only went through relatively minor evolutionary changes from the Mauryan period (3rd century BCE) down to the early Gupta period (4th century CE), and it is thought that as late as the 4th century CE, a literate person could still read and understand Mauryan inscriptions. Sometime thereafter, the ability to read the original Brahmi script was lost. The earliest (indisputably dated) and best-known Brahmi inscriptions are the rock-cut edicts of Ashoka in north-central India, dating to 250–232 BCE.

The decipherment of Brahmi became the focus of European scholarly attention in the early 19th-century during East India Company rule in India, in particular in the Asiatic Society of Bengal in Calcutta. Brahmi was deciphered by James Prinsep, the secretary of the Society, in a series of scholarly articles in the Society's journal in the 1830s. His breakthroughs built on the epigraphic work of Christian Lassen, Edwin Norris, H. H. Wilson and Alexander Cunningham, among others.

The origin of the script is still much debated, with most scholars stating that Brahmi was derived from or at least influenced by one or more contemporary Semitic scripts. Some scholars favour the idea of an indigenous origin or connection to the much older and as yet undeciphered Indus script but the evidence is insufficient at best.

Brahmi was at one time referred to in English as the "pin-man" script, likening the characters to stick figures. It was known by a variety of other names, including "lath", "Laṭ", "Southern Aśokan", "Indian Pali" or "Mauryan" (Salomon 1998, p. 17), until the 1880s when Albert Étienne Jean Baptiste Terrien de Lacouperie, based on an observation by Gabriel Devéria, associated it with the Brahmi script, the first in a list of scripts mentioned in the Lalitavistara Sūtra. Thence the name was adopted in the influential work of Georg Bühler, albeit in the variant form "Brahma".

The Gupta script of the 5th century is sometimes called "Late Brahmi". From the 6th century onward, the Brahmi script diversified into numerous local variants, grouped as the Brahmic family of scripts. Dozens of modern scripts used across South and South East Asia have descended from Brahmi, making it one of the world's most influential writing traditions. One survey found 198 scripts that ultimately derive from it.

Among the inscriptions of Ashoka (c. 3rd century BCE) written in the Brahmi script a few numerals were found, which have come to be called the Brahmi numerals. The numerals are additive and multiplicative and, therefore, not place value; it is not known if their underlying system of numeration has a connection to the Brahmi script. But in the second half of the 1st millennium CE, some inscriptions in India and Southeast Asia written in scripts derived from the Brahmi did include numerals that are decimal place value, and constitute the earliest existing material examples of the Hindu–Arabic numeral system, now in use throughout the world. The underlying system of numeration, however, was older, as the earliest attested orally transmitted example dates to the middle of the 3rd century CE in a Sanskrit prose adaptation of a lost Greek work on astrology.