[s2e3] Lisbon 📍

: In the final season, the Professor gives Alicia Sierra a note to give to Rafael (Berlin’s son).

: Fans often interpret the origami as a symbol of the Professor's "twisting" plans. As he folds the paper, he is mentally adjusting his strategy to stay ahead of the authorities. [S2E3] Lisbon

If you are asking about a specific piece of related to the character Lisbon (Raquel Murillo), it might be the mystery note from the series finale. : In the final season, the Professor gives

: While never shown on screen, it likely referenced "Viking Gold" or "Family Tradition" to convince Rafael to return the stolen gold. Rafael’s response to Lisbon was simply, "It's a family matter". If you are asking about a specific piece

You're likely thinking of the that is a signature of The Professor in the series Money Heist ( La Casa de Papel ).