What is it called when a famous person signs picture?

There isn't one specific term for when a famous person signs a picture. However, you can use different phrases depending on the context:

General terms:

* Autographed picture: This is the most common and straightforward term.

* Signed photo: Similar to autographed picture but emphasizes the act of signing.

* Memorabilia: This term encompasses any item associated with a famous person, including signed pictures.

More specific terms:

* Inscribed photograph: This term is used when the celebrity writes a message along with their signature.

* Personalized photo: Similar to inscribed photograph, but the message is often a greeting or a dedication to the recipient.

Ultimately, the best term to use depends on the specific situation and the message you want to convey.