The Brahmi script evolved into "a vast number of forms and derivatives", states Richard Salomon, and in theory, Sanskrit "can be represented in virtually any of the main Brahmi-based scripts and in practice it often is". Sanskrit does not have a native script. Being a phonetic language, it can be written in any precise script that efficiently maps unique human sounds to unique symbols. From the ancient times, it has been written in numerous regional scripts in South and Southeast Asia. Most of these are descendants of the Brahmi script. The earliest datable "varnamala" Brahmi alphabet system, found in later Sanskrit texts, is from the 2nd century BCE, in the form of a terracotta plaque found in Sughana, Haryana. It shows a "schoolboy's writing lessons", states Salomon.