152 (c) the Senate and the National Assembly jointly, means joint Standing Orders; made in terms of section 6.24; ―statutory body‖ means— (a) a Commission established by this Constitution; or (b) a body corporate established directly by or under an Act of Parliament for special purposes specified in that Act, whose membership consists wholly or mainly of persons appointed by the President, a Vice-President, a Minister, a Deputy Minister, another statutory body or by a Commission established by this Constitution; ―statutory instrument‖ means any instrument that has the force of law and that is made by the President, a Vice-President, a Minister or any other person or authority under this Constitution or an Act of Parliament; ―tax‖ includes a duty, rate, levy or due; ―traditional leader‖ means a person appointed as such in terms of section 14.1; ―Zimbabwe‖ means the Republic of Zimbabwe; ―Zimbabwe Electoral Commission‖ means the Commission of that name established by section 12.7; ―Zimbabwe Human Rights Commission‖ means the Commission of that name established by section 12.11; 18.16 References to Chapters, sections, etc. Any reference in this Constitution, without qualification, to— (a) a Chapter, section or Schedule, is to be construed as a reference to a Chapter or section of or Schedule to this Constitution; (b) a subsection, is to be construed as a reference to a subsection of the section in which the reference is made; (c) a paragraph, is to be construed as a reference to a paragraph of the Schedule, section, subsection or definition in which the reference is made; (d) a subparagraph, is to be construed as a reference to a subparagraph of the paragraph or subparagraph in which the reference is made. 18.17 Words in singular to include plural, and vice versa In this Constitution, words in the singular include the plural and words in the plural include the singular. 18.18 Tables and headings Tables of contents and headings to Chapters, Parts, sections and other provisions of this Constitution do not form part of the Constitution and are inserted for ease of reference only.