Coptic small letter sampi

It is a numeral or cipher sign, not a routine sound-letter.

A 2004 Unicode proposal assigns Coptic sampi the value 900 in the Greek-derived letter-number tradition, says it is absent from lists reciting the Coptic letters, and records its use in cryptograms.

A 2012 study of an ostracon—a pottery fragment bearing writing—describes it in a cryptographic alphabet and leaves open whether that form also represented 900.