Quote:
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The red triangle was a content warning system employed by mainstream terrestrial British TV broadcaster Channel 4 for a brief period in 1986. The channel showed a number of 18 certificate art films in the early hours of the morning as part of the "red triangle" series, gaining unexpectedly large audiences. After lobbying from newspapers and pressure groups the series was quickly discontinued.
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That might explain the traingles in the titles.
Their is also frequency symbols in the titles.