Insular S
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The letter Ꞅ (minuscule: ꞅ) is an Insular script form of the letter S. The uppercase is encoded in Unicode at U+A784, and the lowercase is encoded at U+A785
It should not be confused with the long-legged r, U+027Cɼ LATIN SMALL LETTER R WITH LONG LEG, which is an obsolete IPA symbol.