An exotic particle is a kind of theoretical particle said to exist by some areas of modern physics, and whose alleged properties are extremely unusual.
The best-known example is probably the tachyon, a theoretical particle that always travels faster than light.
Another example of this would be supersymmetry. A theoretical set of super heavy versions of known particles (this is also one of the proposed candidates for dark matter)
Exotic particles are frequently featured in science fiction, either those with real-world academic backing, or entirely fictional.
Famous quotes containing the words exotic and/or particle:
“I do not approve of anything that tampers with natural ignorance. Ignorance is like a delicate exotic fruit; touch it and the bloom is gone.”
—Oscar Wilde (1854–1900)
“Each particle is a microcosm, and faithfully renders the likeness of the world.”
—Ralph Waldo Emerson (1803–1882)