Simplified Common Lisp reference
intern
Symbol class: Symbol, Characters, Hash, Structure, Objects and Conversions
Syntax:
Symbol type: function
internstirngpackage(optional) => symbol, status
Argument description:
stirng a string
package a package designator, default is current package

INTERN function makes a new symbol from string. Possible status values are: :inherited, :external, :internal, or nil.

(intern "MOO") => MOO, NIL
(intern "MOO") => MOO, :INTERNAL
(intern "moo") => |moo|, NIL
Function indexFull documentation for intern (HyperSpec)