Tollan ion cannon
From The Stargate Omnipedia
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Tollan ion cannon
A powerful Tollan weapon used for planetary defense against incoming orbital attack.
Tollana is protected by a planetary network of cannons, which automatically track and destroy threatening ships in orbit. They can also be operated manually, using a small control panel on the side of the weapon.
KEY EPISODES
Pretense - With help from Lya, the Tollan ion cannon is successful at repelling Heru-ur's forces, as well as Zipacna's entourage, from orbit.
Between Two Fires - Having previously refused to share their advanced technology, the Tollan Curia offers Earth their ion cannon technology in exchange for pure trinium.