It's obviously a show of intelligence but also a testament to how hard you're willing to work. I'd like to think mine are a result of sheer hard work and effort, particularly in the case of my A levels and degree. Also, I don't really care for people who put results in their sigs - a) they're probably lying, b) it doesn't affect my life whatsoever, and c) it makes other people embarrassed about their achievements. Oh and I'm not saying this because I'm jealous, I have my fair share of A*s too.. but anyway, once you get to Uni your results at GCSE don't even matter anymore. Likewise with A Levels after you graduate. They're all just 'stepping stones' - so as long as your results have got you to where you want to be, that's all that matters.