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A heptagraph (from the Greek: επτά, heptá, "seven" and γράφω, gráphō, "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⟩ [bɔʁʃt͡ʃ] for Russian/Ukrainian ⟨борщ⟩ (Russian: [borɕː], Ukrainian: [bɔrʃt͡ʃ]) "borscht", is a sequence of a trigraph ⟨sch⟩ [ʃ] and a tetragraph ⟨tsch⟩ [t͡ʃ]. Likewise, the Juu languages have been claimed to have a heptagraph ⟨dtsʼkxʼ⟩, but this is also a sequence, of ⟨dtsʼ⟩ and ⟨kxʼ⟩.
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