The Unicode standard notes "Middle High German" for the application of the grapheme, intended to represent the coronalfricative/s/ also transcribed as tailed z⟨ʒ⟩. The ⟨ȥ⟩-character is used in modern printings of Medieval German literature to indicate those cases of ⟨z⟩ pronounced as [s] (in such a case, modern German now uses ⟨s⟩). In contrast, the ⟨z⟩-character is pronounced as /ts/, as is still the case in modern German. And the ⟨s⟩-character is pronounced as /z/.
z and ȥ in Schade (1868).
"sameȥ-, samȥ-tac" in von Lexer (1876).
Italic z and ȥ in Paul (1918).
Computing codes
This letter's Unicode codepoints are U+0224 and U+0225, for uppercase and lowercase respectively.