What mark in Word displays on the screen but is not visible on a printed document?

In Microsoft Word, the mark that displays on the screen but is not visible on a printed document is known as a "non-printing character." This includes symbols like paragraph marks (¶), spaces (·), and tab indicators (→), which help users format and edit their documents more effectively. These marks can be toggled on or off using the "Show/Hide ¶" button in the toolbar. They are useful for checking formatting without affecting the final printed output.