 In 1940, the "Balarílà ng Wikang Pambansâ" () of grammarian Lope K. Santos introduced the Abakada alphabet.This alphabet consists of 20 letters and became the standard alphabet of the national language.The orthography as used by Tagalog would eventually influence and spread to the systems of writing used by other Philippine languages (which had been using variants of the Spanish-based system of writing).