Noun
ostrakon (plural ostraka)
Alternative form of ostracon
In one anecdote about Aristides, known as "the Just", who was ostracised in 482, an illiterate citizen, not recognising him, came up to ask him to write the name Aristides on his ostrakon. Source: Internet
This was ' ostracism ' each Athenian citizen was required to write on a shard of pottery (ostrakon) the name of a politician that they wished to see exiled for a period of ten years. Source: Internet