The Lao block contains characters used in the Lao script, which is used for writing the Lao language, the official language of Laos. Like the Thai script, the Lao script is an abugida and a tonal language. This block includes characters for consonants, vowels, numerals, and tone marks. The Lao script evolved from the Old Khmer script, and although it shares similarities with the Thai script, it has distinct features and letter shapes. The script is central to the cultural and literary expression of the Lao people and is used in all forms of communication..