e/Multigraph (orthography)

Information
has gloss	eng: A multigraph is a sequence of letters that behaves as a unit and is not the sum of its parts, such as English ch or French eau. The term is infrequently used, as the number of letters is usually specified:
lexicalization	eng: Multigraph
instance of	(noun) a method of representing the sounds of a language by written or printed symbols orthography, writing system