The term Key refers to more than one object:
- The Key to Vector Sigma, the object that activates Vector Sigma in the Generation One Continuity family.
- The Key to the Plasma Energy Chamber, the object that unlocks the Plasma Energy Chamber in the Generation One Continuity family.
- Cyber Planet Keys, the cosmic technology found in the Cybertron portion of the Unicron Trilogy continuity family.
- Key, the powerful object held by Sari Sumdac in the Transformers Animated Continuity family.
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