What does the 'Failure/Malfunction' symbol indicate in Caterpillar equipment systems?

The Failure/Malfunction symbol is used across multiple systems to indicate a fault condition, and specific versions exist for the Engine, Brake System, Hydraulic System, Transmission, and individual components like the Boom System and Bucket System. The Basic section also includes a general 'Failure/Malfunction' pictograph. (Pages 11-13)

From the official Cat Warning Symbols And Meanings Guide manual, page 11

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