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From Latin and meaning "Double".
A "Geminus" is the physical double of another person (like a twin or a clone but without being one), which may have a different personality or similar to "the original" (we consider as "the original" the most precociously followed character) and living a life similar or completely different from "the original".
"Geminus" are often encountered in the field of science fiction, more particularly in the temporal or dimensional journey on "short" periods where, for example, the protagonist meets his "Geminus" in the past time.
Alter Ego (SF)
Physical Alter Ego