name—a string designator or a package object.
package—a package object or
If name is a string designator,
find-package locates and returns the
package whose name or nickname is name.
search is case sensitive.
If there is no such package,
If name is a package object, that package object is returned.
(find-package 'common-lisp) → #<PACKAGE "COMMON-LISP"> (find-package "COMMON-LISP-USER") → #<PACKAGE "COMMON-LISP-USER"> (find-package 'not-there) → NIL
The set of packages created by the implementation.