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Answer:
y-intercept
Explanation:
If the function is graphed as ...
y = f(x)
then y = f(0) is the y-intercept.
_____
Additional comment
Depending on the way the graph is created and labeled, any points or curve on the graph may cross the vertical axis at a point other than one that corresponds to an input of 0. In any event, it may not be called "y". It may be "sales" or "board feet" or "monkeys per acre". Then the name of the point may not be "y-intercept", but may be something else.