Baader-Meinhof Phenomenon
Frequency Illusion · Frequency Effect
The illusion in which a word, a name, or other thing that has recently come to one's attention suddenly seems to appear with improbable frequency shortly afterwards.
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Origin
Coined by a commenter on a St. Paul Pioneer Press online forum in 1994, and named after the Baader-Meinhof terrorist group, also known as the Red Army Faction, which gained notoriety in Germany in the 1970s.