Documents are the files in which users store the content they create in an application.
This shape evokes the concept that a document is like a piece of paper, a typical storage medium for information in an office. Figure 8-33 shows the default document icons that appear in the Finder if you don't supply a custom icon for your documents. You can customize this document page icon so that it relates to your application icon by adding the same graphics you use in your application icon. Or you can add graphics to the document page that indicate the content that your documents hold. Figure 8-34 shows the relationship between an application icon and its document icon.