Gremlin
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A gremlin is a mischievous fictional creature invented at the beginning of the 20th century originally to explain malfunctions in aircraft, and later in other machinery, processes and their operators.
A World War II gremlin-themed industrial safety poster
Gremlin depicted in nose art of a Rockwell B-1 Lancer aircraft of the 28th Bomb Wing.
Royal Air Force pilot and author Roald Dahl flew a Hawker Hurricane during WWII which he incorporated into his 1943 children's novel The Gremlins
William Shatner and the Gremlin (far shot, not in full costume) in The Twilight Zone episode "Nightmare at 20,000 Feet" (1963)
Goblin
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A goblin is a diminutive, grotesque, and often malevolent humanoid creature prominent in European folklore, typically characterized by its mischievous or demonic nature, small stature, furry or leathe
Gremlin
…Froggy the Gremlin, a character on an American TV show in the 1950s Goblin Gremlin Graphics, the now-defunct video games studio…
The Princess and the Goblin by George MacDonald, illustrated by Jessie Willcox Smith, 1920