The Tai Noi (also spelled Thai Noi) or Lao Buhan script is a Brahmic script historically used in Laos and Isan since about 1500 CE. The contemporary Lao script is a direct descendant and has preserved the basic letter shapes. The script has mostly dropped out of use in the Isan region of Thailand, due to the Thaification policies of the Thai government, that imposed Central Thai culture such as the Thai script throughout the country.