The diacritical Spanish mark is known as a tilde (5 letters). It is a diacritical mark that is used in the Spanish language to indicate a change in pronunciation or to distinguish between two words with the same spelling. It is also used in other languages, such as Portuguese and Filipino. The tilde is usually placed over a letter, such as an 'n' or an 'a', to indicate a nasal sound or a palatalized consonant.