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Kataan Probe as seen on Star Trek: The Next Generation (Season 5, Episode 25: The Inner Light. Best. Episode. Evarrr.)
This is the probe that scanned Captain Picard, transferring the memories of a lost civilization to him. In 20 minutes he lives a lifetime on another world.
Picard (as Kamin) has a wife in the alternate reality, Eline, who wears a probe-shaped pendant.