In English, ⟨sh⟩ usually represents /ʃ/. The exception is in compound words, where the ⟨s⟩ and ⟨h⟩ are not a digraph, but pronounced separately, e.g. hogshead is hogs-head/ˈhɒɡz.hɛd/, not *hog-shead/ˈhɒɡ.ʃɛd/. Sh is not considered a distinct letter for collation purposes.
American Literary braille includes a single-cell contraction for the digraph with the dot pattern (1 4 6). In isolation it stands for the word "shall".
In Occitan, sh represents [ʃ]. It mostly occurs in the Gascon dialect of Occitan and corresponds with s or ss in other Occitan dialects: peish = peis "fish", naishença = naissença "birth", sheis = sièis "six". A i before sh is silent: peish, naishença are pronounced [ˈpeʃ, naˈʃensɔ]. Some words have sh in all Occitan dialects: they are Gascon words adopted in all the Occitan language (Aush "Auch", Arcaishon "Arcachon") or foreign borrowings (shampó "shampoo").