Tommy Bennett gave a great lightning talk at CppCon 2016 entitled “Algorithm Mnemonics: Increase Your Productivity With STL Algorithms”. This was really two lightning talks jammed into one. In the second half, Tommy talks about how to increase your productivity with the vim editor simply by learning to use Ctrl+[ instead of ESC because of the distance traveled by your fingers on the keyboard. In the talk, Tommy wonders why Ctrl+[ works for ESC. This short post will explain the mystery of Ctrl+[ along with other interesting characters you can type on your keyboard.