Noun
English Wikipedia has an article on:ostraconWikipedia
ostracon (plural ostraca)
A piece of pottery or stone, usually broken off from a vase or other earthenware vessel, especially one used to cast a vote during the Ancient Greek process of ostracism.
A rare glimpse is offered by an ostracon (inscribed pot-sherd), which was discovered in 1960 in the guardroom of a small Iron Age fortress, approximately 17 km south of Tel Aviv. Source: Internet
Is the ostracon from a piece of a storage jar that would be dated to the 10th Century B.C.? Thus, the inscription would be made later than the jar’s date, but still sometime in the 10th Century B.C. I Thank You for your time and your help. Source: Internet
"נחשת אדם" is copper from Edom,, following the famous ostracon from Tel Qasileh ("זהב אפר") and Mousaieff's (forged) ostracon which mentions "כסף תרשש". Source: Internet