As such, the Pnyx is the material embodiment of the principle of "isēgoría" (Greek: "ἰσηγορία"), "equal speech", i.e. the equal right of every citizen to debate matters of policy. The other two principles of democracy were "isonomía" (Greek: "ἰσονομία"), equality under the law, and "isopoliteía" (Greek: "ἰσοπολιτεία"), equality of vote and equal opportunity to assume political office. The right of "isēgoría" was expressed by the presiding officer of the Pnyx assembly, who formally opened each debate with the open invitation ""Tís agoreúein boúletai?"" (Greek: ""Τίς ἀγορεύειν βούλεται;"", "Who wishes to speak to the Popular Assembly?").