What is the Significance of the Prime Symbol in Probability Events?

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SUMMARY

The prime symbol, denoted as y', is utilized in probability theory to represent the complement of an event. In the expression P(A or B'), the B' indicates the complement of event B, meaning that it refers to all outcomes not included in event B. This notation is consistent with traditional texts in probability, where the prime symbol signifies the complement of a given event.

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montoyas7940
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I have run into a use of the symbol usually called prime (y' for example) in the description of an event.

P(A or B')

Please, what does it mean?
 
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I think some old texts use it as complement.
 
Thanks, that makes sense with the rest of the problem.
 

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