Long s

The long s ⟨ſ⟩, also known as the medial s or initial s, is an archaic form of the lowercase letter ⟨s⟩. It replaced the single s, or one or both of the letters s in a "double s" sequence (e.g., "ſinfulneſs" for "sinfulness" and "poſſeſs" or "poſseſs" for "possess", but never "poſſeſſ"). The modern ⟨s⟩ letterform is known as the "short", "terminal", or "round" s. In typography, it is known as a type of swash letter, commonly referred to as a "swash s". The long s is the basis of the first half of the grapheme of the German alphabet ligature letter ⟨ß⟩, (eszett or scharfes s [sharp s]).