 In the orthographies of some languages, digraphs and trigraphs are regarded as independent letters of the alphabet in their own right.The capitalization of digraphs and trigraphs is language-dependent, as only the first letter may be capitalized, or all component letters simultaneously (even for words written in titlecase, where letters after the digraph or trigraph are left in lowercase).A ligature is a fusion of two or more ordinary letters into a new glyph or character.