skeuomorph
A design feature copied from a similar feature in another object, even when not functionally necessary.
As soon as man began to make things, to fasten a handle to a stone implement, to construct a wattled roof, to weave a mat, skeuomorphs became an inseparable part of his brain, and ultimately occasioned a mental craving or expectancy.
Where it comes from
From Ancient Greek σκεῦος (skeûos, “implement, tool, vessel”) + μορφή (morphḗ, “form”), modeled after zoomorph (“resembling an animal”) and phyllomorph (“resembling a plant”).
Adapted from the Wiktionary entry skeuomorph (CC BY-SA 4.0).