AutoLISP provides a number of functions for handling symbols and variables. The symbol-handling functions are listed in AutoLISP Function Synopsis (AutoLISP), under the heading Symbol-Handling Functions (AutoLISP).
AutoLISP provides functions for handling one or more groups of functions. The links in this topic provides examples of the defun function. The remaining function-handling functions are listed in AutoLISP Function Synopsis (AutoLISP), under the heading Symbol-Handling Functions (AutoLISP).