EDC is Every Day Carry - the things you carry with you every day, to make life a little easier, or maybe a little more enjoyable. EDK is Every Day... Karas? Karry?
This is a pen made to go everywhere with you. It's a little shorter than the Retrakt, but with the same quick and easy click-retract mechanism. The shorter body means you lose the option to use big rollerball refills, but it uses standard Parker-style G2 refills or the Schmidt P8126/P8127 rollerballs, so you're not left short of options.