- Slavic languages - usually the palatalized form of /s/
- Transliteration of Sanskrit and modern Indic languages: see the International Alphabet of Sanskrit Transliteration
- Romany alphabet
- transliteration of a palatalized s in the Lydian language
- In Proto-Semitic, a reconstructed voiceless lateral fricative phoneme /ɬ/, the parent phoneme of Ge'ez Śawt ሠ.
- a sibilant phoneme of the earliest phase of the Sumerian language.
- transliteration of a letter of the Etruscan alphabet, related to San and Tsade.
The HTML codes are:
- Ś for Ś (upper case)
- ś for ś (lower case)
The Unicode codepoints are U+015A for Ś and U+015B for ś.