The Symbols feature in Illustrator saves valuable time by creating a “symbol,” or copy, of an object. This means that all of the time you have spent creating a minutely detailed flower does not have to be repeated. Instead, simply save the flower as a symbol for future use. Plus, symbols greatly reduce the size of image files.
Illustrator makes it easy to use symbols multiple times within a document as well. With the Symbols tools, you can add and alter several symbols at once. And in CS5, you can now change the settings for a symbol while editing. Another benefit of symbols in Illustrator CS5 is that you can change a symbol to a movie clip, making it easy to export to Adobe Flash. You can also make sure that the symbol scales correctly for your interface design by choosing 9-Slice Scaling while still in Illustrator.