11 Septemba bu ubochi nke 11th (nke iri na out) na onwa ana kpo Septemba. Na Gregorian calender, 11 Septemba bu ubochi nke 254th (255th na afo nke ana-kpo leap year) na afo. Anyi nwere agugu ubochi 111 du mgbe afo na agwu. Édémédé nke dị ntakiri. Nye Wikipedia áká Í me kọ sáasa.