What is it?  Symbols and Logos are a major part of our lives, industry and culture.  The Logo Design Toolbox has over 60 great examples of classic logos and discussion on what makes them so effective.  There are also guides and tutorials for budding graphic designers on how to create your own logo that will really stand out from the crowd. 

How can i sue this in the classroom?  This would be a great resource to use with teenagers to discuss why image and branding is so important from both a marketing and cultural angle as well as from a design perspective to discuss the effectiveness of colour, text and imagery coming together to create a clean design that really reflects the product or person it stands for.  As I mentioned also there are some great step by step video tutorials which recreate some famous logos for Photoshop users.