Identify the structure indicated by the number 5 in the figure below. 
Definitions:
Probability
A measure of the likelihood that an event will occur, quantified as a number between 0 and 1.
Union
In mathematics, particularly in set theory, it is the set containing all elements from all sets being considered.
Events A And B
Two occurrences within a probability space that are considered for their individual likelihood as well as their combined or conditional probabilities.
Sample Space
Sample space is the set of all possible outcomes or results of a probabilistic experiment.
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