Top Symbol

OK, answer to my question from last week. Currency symbols such as $ is a very good guess, may be it is the right one. But my guess is, it's the ubiquitous Universal Recycling Symbol considering it is on every can and bottle of any beverage sold, every sheet of paper napkin in fast food restaurants, every magazine and every pamphlet and even junk mail printed, every credit card statement, utility statement etc. Even if it is not at top currently, considering the decline in paper money and increase in recycling (and legislations mandating it), it won't be too long before it reaches the top. It even has its own Unicode representation. You can read the story of this symbol here.