The document discusses various typographical clues and punctuation marks that are used in writing. It explains that typography is used to visually organize information and hierarchy ideas in a way that makes relationships obvious. Specific typographical clues mentioned include headings, fonts, symbols, and punctuation marks. Various punctuation marks such as dashes, parentheses, brackets, colons, quotation marks, ellipses, and italics are then defined and examples of their uses are provided. The document concludes that typographical signs can be used for statement, exemplification, clarification and other purposes.