Ṡ
Ṡ u+1E60 (lowercase: ṡ u+1E61 or ẛ) is a letter of the extended Latin alphabet, formed by S with the addition of a dot above. In Irish orthography, the dot was used only for ẛ and ṡ, while a following h was used for c, p, and t; lenition of other letters was not indicated.