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No Explanations for Boolean expressions

In the book 'CSS Pocket Reference, 4th Edition' I can find strange symbols like: '|' or '||' or '*' and others. Have a look at the image below.

I expect most of them to be a kind of boolean operators but what exactly do they mean and where can I find any explantions about these signs. I couldn't find any in the book.

Kind regards
Roger Kaufmann
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