Holographic projection

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A holo-projection was a hologram used for the purposes of trickery, especially in a starship battle.

Cardassians used sensor ghosts and holo-projections during the Klingon-Cardassian War, a fact that Leskit recalled when comparing the differences in honor between the Cardassians and the Jem'Hadar. (DS9: "Soldiers of the Empire")