+**Ff** often marks *fortissimo* in [music](/wiki/Music), a command to play with great force and volume. This dual letter also functions as a distinct [digraph](/wiki/Digraph) in certain orthographies.
+## See also
+- [Fortissimo](/wiki/Fortissimo)
+- [Musical Dynamics](/wiki/Musical_Dynamics)
+- [Letter F](/wiki/Letter_F)
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