Decagon

The Decagon is a building located in Iacon from the Dreamwave portion of the Generation 1 continuity family.

The Decagon is a fortress-like building on the western perimeter of the city of Iacon, located among the High Council Pavilions. It is the main Autobot control center of planetary security and defenses.

Fiction

Generation 1

Dreamwave comics continuity

Jazz, Prowl and Bumblebee were in the Decagon discussing Optimus Prime's decision to head underground alone to face Megatron after the destruction of the Forum of Enlightenment. Skids alerted them to an incoming attack of Decepticon fighters under the leadership of Shockwave. War Within #2

The four Autobots managed the battle from the Decagon, sending out marching orders and battle assistance to their troops. Jazz declared the attack on the Decagon as "really stupid" since it was the Autobots' strongest position on the planet. Meanwhile, Prowl wondered aloud if that current attack, the destruction of the Forum, and the disappearance of their leader were all somehow connected. War Within #3

After the Decepticons successfully invaded Iacon, Prowl's group gathered in the Decagon for one last rousing speech before going into battle with the enemy. The building was presumably destroyed along with most of Iacon when Starscream engaged Cybertron's sub-planetary mechaforming platform. War Within #5

War for Cybertron

Following the death of Zeta Prime, the newly risen Optimus Prime sought to travel down the Iacon speedway in order to reach the Decagon so he could communicate with the Autobot ground forces. War for Cybertron