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A nautilus shell
Picard's nautilus shell
For the starship, please see USS Nautilus.
The nautilus was a type of aquatic mollusk native to Earth.
When Spock tried to match the sound of the Whale Probe to the sound of an Earth animal in the phylum search mode aboard the Klingon Bird-of-Prey HMS Bounty, a nautilus was one of the animals shown. (Star Trek IV: The Voyage Home)
The scientific name for the nautilus was shown as Chama arcana, which is the scientific name of the secret jewelback, a species of clam.
For some time, Captain Jean-Luc Picard kept a nautilus shell in his ready room aboard the USS Enterprise-D. (TNG: "The Defector"). The nautilus shell was not seen in Picard's ready room after the Battle of Wolf 359. (TNG: "The Best of Both Worlds, Part II")