Reticulum is a name used for the home planet of the Reticulians, or "Greys." It is presumably located in the Reticulum galaxy.

In 1993, FBI Special Agent Fox Mulder jokingly asked Agent Tom Colton for the price of liver and onions on Reticulum while investigating the Eugene Victor Tooms case. — (Squeeze)

In real life, people hypothesize that the Grey aliens come from the Zeta Reticuli star system.
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