http://agathe.gr/democracy/political_organization_of_attica.html
Political Organization of Attica: Demes and Tribal Representation Each tribe was divided into three parts, and each third (trittys) was from one of the three regions of Attica, plain, coast, or hills ... On one side of each plaque the name of a tribe is written: ΛΕΟ for the tribe of Leontis, and ΕΡΕ for the tribe of Erechtheis. On the other side is the name of the deme office: ΠΟΛ probably Poletes, an official auctioneer.