Hologram

"Help me, Obi-Wan Kenobi, you're my only hope *static* Help me, Obi-Wan Kenobi, you're my only hope."

- Leia Organa's message to Obi-Wan Kenobi

A hologram was a visual projection of a person or object, generally used for communication or entertainment purposes.

Members of the Jedi Council often dispatched to missions on remote worlds, nevertheless regularly participated in Council meetings held at the Jedi Temple by appearing as holograms.

Holographic technology was sophisticated enough, that a holographic image could be made to project a smaller holographic image, as in the case of a holographic image of R2-D2 projecting a message of Princess Leia.