What does the letter z stand for as a cardinality symbol?

The cardinality symbol Z indicates zero or one child

Explanation:

Cardinality is an element for specifying the number of entity instances included in a relationship. If you consider the cardinality for the link between the entities class and course, you will realize that somebody can teach the same course in different classes and viceversa. This represents a nonidentifying relationship. In the case of the letter Z, it indicates that there is either zero or just one child.

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explanation:

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