While Thai people will often refer to their country using the polite form ''prathet Thai'' (), they most commonly use the more colloquial term ''mueang Thai'' () or simply ''Thai;'' the word ''mueang'', archaically referring to a city-state, is commonly used to refer to a city or town as the centre of a region. ''Ratcha Anachak Thai'' () means 'kingdom of Thailand' or 'kingdom of Thai'. Etymologically, its components are: ''ratcha'' (, ''rājan'', 'king, royal, realm'); ''-ana-'' (Pali ''āṇā'' 'authority, command, power', itself from the Sanskrit , ''ājñā'', of the same meaning) ''-chak'' (from Sanskrit  ''cakra-'' 'wheel', a symbol of power and rule). The Thai National Anthem (), written by Luang Saranupraphan during the patriotic 1930s, refers to the Thai nation as ''prathet Thai'' (). The first line of the national anthem is: ''prathet thai ruam lueat nuea chat chuea thai'' (), 'Thailand is the unity of Thai flesh and blood'.