S̈, s̈ in lower case, also s with diaeresis, is a letter in the Latin alphabet for the Chechen language, where it represents the voiceless postalveolar fricative[ʃ]. It has the same sound as the š used in Slavic languages written with the Latin alphabet, the Turkish/Romanian ş and the common digraph "sh".
In the Chechen language, it was changed from the original ş into s̈, at the same time that ç was changed into c̈.[when?][citation needed]
In older Czech orthography s̈ was used in codas instead of ſſ for /ʃ/, modern orthography uses š for all instances.