I will occasionally see a question in the OTN/MOSC forums asking what a specific icon means in SQL Developer. There is no documentation on the subject so we often have to figure it out on our own. My personal preference is that when we mouse over the icon, a tooltip will popup telling us what the icon means. Until we get that feature, or something similar, I decided to start documenting them here in my blog. Here they are:
If anyone has any icons I missed, private message me on Twitter (@BPeaslandDBA) or get in touch with me some other way, and I will update this blog post.