Would this be a valid question anywhere at SE?
What is the most recognisable graphical element spring 2012 that would make you realise that this page exists in XML format too (not rss)
Unfortunately, no version of your question would be suitable for Stack Exchange, the problem wasn't its wording. You are polling for people's opinions and that doesn't really work with the Q&A format. The main problem with your question is that there is no sane way of validating the answers, as every possible answer is equally valid. For example let's say that I posted this as an answer:
And then I ask 20 of my buddies who are active on various Stack Exchange sites to upvote it. How would you know that this +20 answer is what you are looking for? How would any one else know? There simply aren't any actual parameters in your question to test answers against, other than the extremely vague and unmeasurable "most recognisable".
Stack Exchange sites work when the best answers float at the top, and they fail miserably on questions like yours, as there's simply no way to ensure that the highest voted answer is the best. Real questions have answers, not items or ideas or opinions.
Furthermore, while we welcome some subjective questions on Programmers, we expect all questions to require the unique expertise of software developers. And choosing an icon has nothing to do with our professional expertise, regardless of the fact that a part of your target audience (may be) programmers. It's a user experience question, but for all the reasons I explained above and because icon questions tend to be too localized, your question isn't suitable for User Experience Stack Exchange as well.