Quaker gun

Quaker Guns were logs of wood that were made to look like cannons on Earth to fool an enemy into thinking a location was more fortified than it actually was.

In a fake database Drex took from a database on Deep Space 9 in 2372, Starfleet said they had installed 24th century versions of Quaker Guns on the space station. (DS9 novelization: The Way of the Warrior)