Heptagraph
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A heptagraph (from Template:Langx, Template:Tlit 'seven' and Script error: No such module "Lang"., Template:Tlit 'write') is a sequence of seven letters used to represent a single sound (phoneme), or a combination of sounds, that do not correspond to the individual values of the letters.
Heptagraphs are extremely rare. Most other fixed sequences of seven letters are composed of shorter multigraphs with a predictable result. The seven-letter German sequence ⟨schtsch⟩, used to transliterate the Russian and Ukrainian letter ⟨щ⟩, as in ⟨Borschtsch⟩ Script error: No such module "IPA". for Russian/Ukrainian ⟨борщ⟩ (Script error: No such module "IPA"., Script error: No such module "IPA".) "borscht", is a sequence of a trigraph ⟨sch⟩ Script error: No such module "IPA". and a tetragraph ⟨tsch⟩ Script error: No such module "IPA".. Likewise, the Juu languages have been claimed to have a heptagraph ⟨dtsʼkxʼ⟩, but this is also a sequence, of ⟨dtsʼ⟩ and ⟨kxʼ⟩.
Another theoretical example of a heptagraph would be the traditional Irish spelling oidhche 'night' for modern oíche, but only for the pronunciation /iː/ as found in the Cois Fharraige dialect.
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References
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