The original Ramones style logo for those badass Dalek boys, the Cult of Skaro. You saw it here first!
The symbols in the middle are the recognition codes for each member, which if you look closely at this picture of Dalek Sec, you’ll see is located just underneath the eye stalk. From top to bottom you have the recognition code of Sec (leader), Thay (lowest voice pitching), Caan (middle pitch), and finally Jast (highest pitched voice).
The original plan was to have a Dalek in there, but then I remembered the recognition codes and thought it’d be a bit cooler, a bit more subtle and a hell of a lot geekier. Let’s face it, us Whovians know no limits when it comes to how geeky we’ll go…
Also available as a t-shirt: