deflector dish

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The navigational deflector (also known just as the deflector, or the deflector array, the deflector dish, the main deflector or the nav deflector for short) was a component of many starships, and was used to deflect space debris, asteroids, microscopic particles and other objects that might have collided with the ship. At warp speed the deflector was virtually indispensable for most starships as even the most minute particle could cause serious damage to a ship when it was traveling at superluminal velocities. (Source en.memory-alpha.org)