By Xah Lee. Date: 2002-02-28. Last updated: 2022-01-01. A Lambda Logo Tour (and why LISP languages using λ as logo should not be looked upon kindly) Dear lispers, The lambda character λ, always struck a awe in me, as with other mathematical symbols. In my mind, i imagine that those obscure math symbolism are etched in stone by god. A salient example is the book cover Concrete Mathematics by Ronald