You probably mean reader macros. Here are a few resources: Hyperspec reference for predefined sharpsign reader macros: http://www.lispworks.com/documentation/H

You probably mean reader macros. Here are a few resources: Hyperspec reference for predefined sharpsign reader macros: http://www.lispworks.com/documentation/HyperSpec/Body/02_dh.htm http://www.lispworks.com/documentation/HyperSpec/Body/02_dh.... A blog post where Vsevolod Dyomkin creates a reader macro to notate list comprehensions to his liking: http://lisp-univ-etc.blogspot.com/2013/01/real-list-comprehensions-in-lisp.html http://lisp-univ-etc.blogspot.com/2013/01/real-list-comprehe... A blog post where Inaimathi mentions using CLSQL reader macros to facilitate reading SQL expressions in code: http://langnostic.blogspot.com/2011/03/clsql-and-nothing-else.html http://langnostic.blogspot.com/2011/03/clsql-and-nothing-els... Let Over Lambda chapter 4 which has various examples: http://letoverlambda.com/index.cl/guest/chap4.html http://letoverlambda.com/index.cl/guest/chap4.html