[view·edit·purge]A gremlin is an imaginary creature commonly depicted as mischievous and mechanically oriented, with a specific interest in aircraft. Gremlins' mischievous natures are similar to those of English folkloric imps. They became more well-known thanks to the famous 1984 film of the same name, which depicts gremlins as the main antagonists.
Its Japanese name is "Practi." This is likely derived from "practical joker."