Baader Meinhof Phenomenon
The Baader Meinhof Phenomenon is a Cognitive Biase in which you notice a particular thing everywhere after noticing it somewhere.
A common example is buying a car and suddenyl seeing it everywhere.
Why is it called the Baader-Meinhof Phenomenon?
Kate Kershner has the following explanation in her What’s the Baader-Meinhof phenomenon? :
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It all started in the comments section of a newspaper called the Minnesota St. Pauls Pioneer Press. During the 90s, one commenter talked about the Baader-Meinhof group, which was a West German terrorist organization, and within hours, he saw another reference to the group. Hence, the term was coined as the Baader-Meinhof phenomenon.