Looks like (from a google search on 'greece power plug') they use the same style plug as the main part of europe; two round pins in a flat plug (ungrounded only) or round plug (ungrounded or grounded (2 tabs 180 dwgrees apart on the perimeter)- but having somewhat smaller diameter on the pins than the 'normal' european. Flat plug fits in the round outlet, both ungrounded and grounded ones, as it's mainly used for double isolated devices. Ungrounded round plugs don't fit grounded outlets.