Part XVII of the Constitution deals with Official Language. Article 343 (1) states that the official language of the Union shall be Hindi in Devanagari script. It also specifies the use of the international form of Indian numerals for official purposes of the Union. Clause (2) provided for the continued use of English for official purposes for a period of fifteen years from the commencement of the Constitution, and clause (3) allowed Parliament to provide for the continued use of English even after that period by law (which led to the Official Languages Act, 1963).