digraph
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A digraph is a pair of letters that work together to represent a single sound in a language. They matter because they allow written languages to represent more sounds than they have individual letters for, making it possible to write words accurately and consistently.
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Article
In Welsh, the digraph ⟨ll⟩ fused for a time into a ligature.
A digraph (from Ancient Greek δίς (dís) 'double' and γράφω (gráphō) 'to write') or digram is a pair of characters used in the orthography of a language to write either a single phoneme (distinct sound), or a sequence of phonemes that does not correspond to the normal values of the two characters combined.