Reference marks are symbols used to indicate a specific point in a text. The two most common reference marks are obelus (or obeli) and asterisks (or STARS). Obelus is a symbol that looks like a division sign (÷) and is used to indicate a footnote or a correction. Asterisks are used to indicate emphasis, a break in thought, or an interruption. They are also used to indicate a footnote or a correction. Both of these reference marks are used to help readers better understand the text.