This page contains information regarding Star Trek: Picard, and thus may contain spoilers.
Pixmit were triangular cards created by the Romulans. They depicted elements of Romulan culture such as shaipouin ("false door") and Seb-Cheneb ("the Destroyer"). Pixmit could be used for games like playing cards, or arranged to form patterns. (PIC: "The End is the Beginning", "Absolute Candor")
In 2399, the Romulan xB Ramdha was arranging pixmit when she was visited by Soji Asha and Hugh. Asha, who knew of the cards, wondered if Ramdha was using the cards to tell fortunes, was making a kind of mandala, or if she was associating its images with Romulan mythology. She continued to place the cards while Asha spoke with her, until the final card led her to accuse Asha of being Seb-Cheneb. After the incident, Asha took to studying the cards. (PIC: "The End is the Beginning", "Absolute Candor")