They are always the same distance apart and go in the same direction, as we can observe. These two lines run parallel to one another. The two lines that make up the letter L are also not parallel. But we may claim they're perpendicular. They cross each other at a right angle. Capital letters are used to identify words or names of people. So it is important that these letters be clearly seen by everyone reading your message. If you write something like this: "The man walked down the street with his head held high..." It would be difficult to read because there are three different types of letters being used: capital, small, and title case. To make reading easier for those who view your document on a screen, keep in mind that both Microsoft Word and Adobe Reader allow you to change the default font used throughout the file. This will make it easier for anyone viewing the document to understand what words are being talked about here and there.