Toranium was a strong metal used in Cardassian construction. Toranium was used in the structure of Terok Nor (DS9 episode: "The Forsaken") and Sentok Nor. (TNG novel: The Battle of Betazed)

Federation Starbase Deep Space 10, which incorporated a number of Cardassian ideas into its design, had eleven toranium hull layers. This was fewer than the thirteen layers used in Terok Nor (and presumably all Nor-class stations), but used the same amount by having thicker hull layers. (CoE eBook: Troubleshooting)

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