I got this nickname from the title of a book by L. Sprague DeCamp. It's not high literature. It's pretty trashy, in fact, but I was instantly enamoured with the main character, Zdim, from the first time I read the book more than 25 years ago. In fact, my nickname back in those days was zdim, and people who talked to me back in the earlier days of the Internet would have spoken to me as that alias.

The book is about this reptilian creature from the twelfth dimension who gets brought to our reality by a magician. He's a creature of pure logic who has a few adventures while trying to carry out the instructions given to him by his foolish and evil master.

Also it hints at philosophical and personal fallibilism.