Baader-Meinhof Phenomenon
This is a psychological experience.
When I describe it in full, if you are of any age, you will almost
certainly think "oh yes, that has happened to me."
For older listeners, the name Baader-Meinhof might be memorable as a
name given to a group who liked to call themselves the 'Red Army
Faction.'
The name Baader-Meinhof, after two notable members of the group, was
given to it by journalists.
In the late sixties, all through the seventies, and even into the
eighties, the Red Army Faction were responsible for a number of
terrorist attacks in and around East and West Germany. One person's
terrorist is another person's freedom fighter, but we will not get into
that discussion.
This psychological phenomenon was given the name, after a man wrote a
letter to a newspaper in 1994 pointing out that he had recently heard
the name, Baader-Meinhof, and thereafter, seemed to hear or see it again
and again.
Following that, many people wrote to the same newspaper making
similar comments, about recently heard names, usually nouns, which were
then noticed by them frequently.
The phenomenon was also given the name 'Frequency Illusion' in
2005.
Wikipedia
Here is
the Wikipedia link to the page for the 'Frequency Illusion', also known
as the 'Baader-Meinhof Phenomenon.