I just edited the tags of this question. I'm surprised we don't have a tag for the Tsiolkovsky Rocket Equation. Shouldn't we have one?
Sure, I don't see why not, so I added rocket-equation to the question, creating a new tag. I also added a synonym tsiolkovsky-rocket-equation to it. Note that you can also create new tags yourself by simply typing it in the list of tags when editing or asking a new question, and is one of the site privileges granted to members during beta when reaching 150 site reputation points. And you should soon reach the next privilege at 1,250 points to also suggest tag synonyms yourself.