Show or Hide Nonprinting Characters in Word 2007
Word uses various symbols to represent nonprinting characters in Word 2007. To show or hide these on-screen elements that you normally don’t see — such as spaces, tabs, and the Enter key — click the Show/Hide button on the Home tab in the Paragraph group. Click once to show the items; click again to hide them.
For example, some of these elements are shown on the following line:
Sometimes it's useful to see the marks to check out what's up with formatting, find stray tabs visually, or locate missing paragraphs, for example.
The keyboard shortcut for the Paragraph button is Ctrl+Shift+8.