What is "kharosthi"

The Kharoṣṭhī script is an ancient script used in ancient Gandhara (primarily modern-day Afghanistan and Pakistan) to write the Gandhari Prakrit and Sanskrit. It was popular in Central Asia as well. An abugida, it was in use from the middle of the 3rd century BCE until it died out in its homeland around the 3rd century CE. It was also in use in Bactria, the Kushan Empire, Sogdia and along the Silk Road, where there is some evidence it may have survived until the 7th century in the remote way stations of Khotan and Niya. Kharoṣṭhī is encoded in the Unicode range U+10A00–U+10A5F, from version 4.1.0.