 To represent these new sounds, extensions were therefore created, be it by adding diacritics to existing letters, by joining multiple letters together to make ligatures, by creating completely new forms, or by assigning a special function to pairs or triplets of letters.These new forms are given a place in the alphabet by defining an alphabetical order or collation sequence, which can vary with the particular language.Some examples of new letters to the standard Latin alphabet are the Runic letters wynn and thorn , and the letter eth , which were added to the alphabet of Old English.