Alternate timeline
(covers information from an alternate timeline)
Forehead cast

A cast of Alexander's ridges

A cast was an impression of a surface made in a pliable material.

In 2370 of an alternate timeline, Alexander Rozhenko made a cast of his cranial ridge to give to his father. Deanna Troi passed it on after the boy left to visit his grandparents. (TNG: "Parallels")

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