Sh is a digraph of the Latin alphabet, a combination of S and H.
In Albanian, sh represents [ʃ]. It is considered a distinct letter, named shë, and placed between S and T in the albanian alphabet.
In Breton, sh represents [s]. It is not considered a distinct letter and it is a variety of zh (e. g. koshoc'h ("older"). It is not considered as a diphthong in compound words, such as kroashent ("roundabout": kroaz ("cross") + hent ("way", "ford").
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".