Śat (ሰ) is a letter of the Geʽez script. It is descended from South Arabian 𐩪. It represents both a historical "s" /s/ (a voiceless alveolar fricative), like the s in sink and "ṯ" /θ/ (a voiceless dental fricative), like the th in think.
It has the unicode designation U+1230 Ethiopic Syllable Sa.
References
See also Ḍäppa ፀ Śawt ሠ Proto-Semitic Shin (letter) Samekh