Iris

An iris is a device designed to prevent unwanted incomming gate traffic developed by Stargate Command. The Iris is a Metalic Barrier several milimeters fro the event horison of an active stargate. Anything that goes through a Stargate with an open stargate will fail to rematerialize and be destroyed. Radio Waves can pass through a Gate allowing for SG Teams to send confirmation codes to get through.

Analogues

The Goa'uld occasionally use a system involving an Energy Shield to the same effect.

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