In a screen cast (archived blog) on Common List the author (Alexander Lehmann) uses uninterned symbols for package names and exports.

(defpackage #:foo
  (:use :cl)
  (:export #:bar
           #:baz))

(in-package #:foo)

He also uses the sharp sign in front of anonymous functions.

(defun transposed (m)
  (make-instance 'matrix
                 :rows (matrix-cols m)
                 :cols (matrix-rows m)
                 :generator #'(lambda (i j) (matrix-at m j i))))

In the book Practical Common Lisp the sharp sign isn't used for package names and exports as far as I have read.

What's the reason for using the uninterned symbols (the sharp sign) in these cases?

lisp common-lisp symbols
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