I think it should be LATIN SMALL LETTER SHARP S. See https://codepoints.net/U+00DF and https://www.unicode.org/charts/PDF/U0080.pdf (page 4)

Mats

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Mats Dufberg

mats.dufberg@internetstiftelsen.se

Technical Expert

Internetstiftelsen (The Swedish Internet Foundation)

Mobile: +46 73 065 3899

https://internetstiftelsen.se/