Sz is a digraph of the Latin script, used in Hungarian, Polish, Kashubian and German, and in the Wade–Giles system of Romanization of Chinese.
In Polish orthography, sz represents a voiceless retroflex fricative /ʂ/, similar to English "sh". It usually corresponds to ш or š in other Slavic languages.
sz should not be confused with ś (or s followed by i), termed "soft sh", a voiceless alveolo-palatal fricative /ɕ/.
obszar (area, territory)
płaszcz (coat, cloak)
Tomasz (Thomas)