Legal provisions for optional referendums at national level

Egypt
Constitution 2014
https://www.constituteproject.org/constitution/Egypt_2014.pdf
Article157: Referendum
ThePresident of the Republic may call for a referendum on issues relating to the supremeinterests of the country without prejudice to the provisions of the Constitution.
Ifthe call for a referendum relates to more than one issue, the people must voteon each individual issue.