Good question. I’ve been asked this question recently. Here is the most definitive answer I can cobble together:
It’s a symbol I’ve been using in my signature for years to differentiate myself from all the other dks. I don’t have a name for it, I’m not entirely sure why.
You’ll see it in at least one place (my signature) in just about everything I have done. In high school I used the eye of horus ,which at the time I called the arcane eye, as part of my signature . Some people started thinking it was a reference to the band The Sisters of Mercy and I began to see it in a number other places, so I dropped it for the upside down 2. The symbol is just a couple of strokes that are natural and comfortable for me to make. I figured if I made something up I wouldn’t keep seeing it everywhere, but admittedly I still see similar marks on occasion . It was never really intended to be a 2, but that’s what it basically is. In it’s true form the round part should curl a bit more than most 2s. For a number of years I also hid it in a kind of Where’s Waldo fashion in everything I did, but I have become more productive over the years and slowly started to forget to include it in everything. Curiously I am the second of three sons with the initials ‘dk’ , so the fact that it is a 2 makes some sense in the roundabout logic of explaining things after the fact.
I’ve included an image from a Dungeons & Dragons book from a few years back where the symbol was repeated several times.