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⟨ph⟩

From Teflpedia

⟨ph⟩ is an English consonant digraph consisting of the letters P and H.

It very reliably represents the unvoiced labiodental fricative /f/ sound. There’s one exception to this; in the personal name Stephen, ⟨ph⟩ is pronounced as a voiced labiodental fricative /v/. And in nephew the traditional pronunciation is /v/, but most people today use /f/.

Words with this in tend to be of Ancient Greek origin, e.g. photograph, phylum and physics, where it is derived from the letter phi.

The letter combination of ⟨p⟩+⟨h⟩ can also occur across syllable boundaries, for example in Clapham and haphazard in which case it’s not a digraph.