Bengali (বাংলা) is an eastern Indo-Aryan language. It is native to the region of eastern South Asia known as Bengal, which comprises present day Bangladesh, the Indian state of West Bengal, and parts of the Indian states of Tripura and Assam. It is written using the Bengali script. With about 220 million native and about 250 million total speakers, Bengali is one of the most spoken languages (ranked sixthth) in the world. The National song and the national anthem of India, and the national anthem of Bangladesh were composed in Bengali. The Bengali script is an abugida, a script with letters for consonants, diacritics for vowels, and in which an "inherent" vowel is assumed if none is written. The Bengali script is a cursive script with eleven graphemes or signs denoting nine vowels and two diphthongs, and thirty-nine graphemes representing consonants and other modifiers. There are no distinct upper and lower case letter forms.