Encyclopedia
The letter is an insular
Insular script
Insular script was a medieval script system originally used in Ireland, then Great Britain, that spread to continental Europe under the influence of Celtic Christianity. Irish missionaries also took the script to continental Europe, where they founded monasteries such as Bobbio. The scripts were...

 form of the letter S
S
S is the nineteenth letter in the ISO basic Latin alphabet.-History: Semitic Šîn represented a voiceless postalveolar fricative . Greek did not have this sound, so the Greek sigma came to represent...

. The uppercase is encoded in Unicode
Unicode
Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems...

 at U+A784, and the lowercase is encoded at U+A785.

It should not be confused with the long-legged r
R
R is the eighteenth letter of the basic modern Latin alphabet.-History:The original Semitic letter may have been inspired by an Egyptian hieroglyph for tp, "head". It was used for by Semites because in their language, the word for "head" was rêš . It developed into Greek Ρ and Latin R...

, ɼ, which is an obsolete IPA symbol.
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