What is ap on signed Norman Rockwell art print?

"AP" on a signed Norman Rockwell art print stands for "Artist's Proof." Artist's proofs are a limited edition of prints that are typically produced before the main edition and are often considered more valuable due to their scarcity. These prints are usually signed by the artist, making them sought after by collectors. Rockwell's works, known for their nostalgic and heartwarming themes, often carry significant cultural value, enhancing the appeal of the AP editions.