We're rebuilding an online platform for online commerce and are thus contemplating hiding the product menu (represented as a tree, usually with a depth of three or so) and only making it appear on mouseover someplace that attracts the user's attention.
Naturally, we could just have it say "Products" in plain text, but a graphical icon would be a better fit with our overall design (a looking glass for product search, a shopping cart for check-out, etc.) The icon should preferably be pretty self-explanatory even if it's rather small. Perhaps as small as 16x16.
I'm not a GUI designer, but rather a dev working closely to the visual design team. And my thinking is we might want to go with what I can only describe as "a binary tree structure with right angles" (I'm not good with the graphicy stuff), while others have put forth more mundande objects, such as actual trees, or stars.