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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). It stands for the word "shall" in isolation.
In Spanish, the combination appears in compound words such as deshecho, mainly combinations of prefix des- and a word beginning with h; in these cases it is not a digraph, as the letter s is pronounced normally, i.e., [s], and the h is silent as usual. In normative Spanish the "sh" is pronounced like an "s" always.
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").
For s·h, see Interpunct#Occitan.