Hierarchical Product Taxonomy
Recently, I was preparing for a very cool brown-bag session at a client's offices, when I wanted to include a demonstration around product taxonomies. These structures are typically presented as some kind of a hierarchy/tree on many eCommerce websites - and are very well known by online users. So I wanted to find a taxonomy, and here here, Google immediately came to the rescue. I found this page on the Google Merchant Center.
You can follow the link to the Excel file, and boom - there's your product Taxonomy for you.