Formatting marks
Formatting marks are non-printing characters that indicate controls within paragraphs, such as end markers, spaces, tab characters and so on. Displaying them shows you exactly what you have typed and can help to highlight layout problems; for example, where you have typed several spaces rather than a tab character. Hiding them shows you more how the finished document might look. Even if formatting marks are showing, they will not be in the final output.

To show/hide formatting marks:
Click Formatting Marks or select View/Show all Paragraphs to switch them on or off.