The end goal of using repetition typography is to make the eye follow through where the designer needs the eye to go. One good example of this dynamic is in the use of bold text for repetition. In the example at the left you can see basic general information at the top of the business card. Notice that in the first example, the only bold type is at the top. By using just the bold element at the top, the design allows the eye to fall away from the text and move on in search of something else to focus on.
In the bottom example, we see that the bold text has been repeated. By using the bold text again with the bottom type it allows the eye to focus on the bold element and, in doing so, makes the eye flow back up to focus on the bold text at the top. Repeating the bold element in this fashion creates a focus loop for the eye where it will repeatedly go between the top and bottom text. To get a better view of this example, click on the image and it will open a new window.
Other examples of repetition typography are repeating the same word or letters throughout a design, repeating the same color scheme for certain letters and words, and forcing the eye to search for bold strokes within text by repeating the element of special ascenders or descenders in letter characters.
For more information on the use of repetition typography and other design elements that can be used through typography, see the article series Understanding Typography, which begins by answering the question What is Typography? and will lead to the explanation of ascenders and descenders in typography.
*Image used was created and edited by the author using Picnik.