What are these red link icons?

What are these red link icons? - Red Telephone Booth

I have just updated my game and noticed that when I play some of my character skills have red chain icons with letters. I have highlighted them in the image with a pink circle.

What are these icons and what do they mean?

Golden bomb event

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What are these red link icons? - Worm View of Golden Gate Bridge
What are these red link icons? - Red and White Metal Gauge With Arrows Pointing to 48 and 4
What are these red link icons? - Signboard video surveillance placed on window in daytime



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Images: Mike B, Jacob Morch, Chitokan, Erik Mclean

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