To be really pedantic (sorry! I'm not complaining about your comment), your keyboard does not have any key labelled 'control', it is always (AFAIK) abbreviated as 'ctrl'. Which is really weird to me, as it's hardly a big word needing abbreviating, and keyboards often have other long words written on the keys ('delete', 'page down', and so on).
On top of that, the shortened 'ctrl' is really a terrible abbreviation. It's not obvious that it stands for 'control' and I would guess that most non-techy people would have no idea that it means this word. Plus, it's near to another key with multiple letters ('alt'). The overall effect is that 'ctrl' appears to just be a jumble of letters with some esoteric meaning. A really odd design decision. Why not just put 'control' on the key and be done with it?