Nineteen regional languages act as auxiliary official languages used as media of instruction: Aklanon, Bikol, Cebuano, Chavacano, Hiligaynon, Ibanag, Ilocano, Ivatan, Kapampangan, Kinaray-a, Maguindanao, Maranao, Pangasinan, Sambal, Surigaonon, Tagalog, Tausug, Waray, and Yakan. Other indigenous languages such as, Cuyonon, Ifugao, Itbayat, Kalinga, Kamayo, Kankanaey, Masbateño, Romblomanon, Manobo, and several Visayan languages are prevalent in their respective provinces. Article 3 of Republic Act No. 11106 declared the Filipino Sign Language as the national sign language of the Philippines, specifying that it shall be recognized, supported and promoted as the medium of official communication in all transactions involving the deaf, and as the language of instruction of deaf education.