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A heptagraph is a seven-letter sequence of letters that behaves as a unit and is not the sum of its parts. Morse code, for example, uses a heptagraph, ⟨· · · — · · —⟩, for the dollar sign.

Heptagraphs are extremely rare. The seven-letter German sequence ⟨schtsch⟩, used to transliterate the Russian letter ⟨щ⟩, as in ⟨Borschtsch⟩ for ⟨борщ⟩ "borscht", is a sequence of a trigraph ⟨sch⟩ and a tetragraph ⟨tsch⟩ rather than a heptagraph. Likewise, the Juu languages have been claimed to have a heptagraph ⟨dts’kx’⟩, but this is also a sequence, of ⟨dts’⟩ and ⟨kx’⟩.

See also

• Multigraph (orthography)
• Digraph (two letters, as ⟨ch⟩ or ⟨ea⟩)
• Trigraph (three letters, as ⟨tch⟩ or ⟨eau⟩)
• Tetragraph (four letters, as German ⟨tsch⟩)
• Pentagraph (five letters)
• Hexagraph (six letters)

References

• Multigraphs (orthography)