It is usually called impossible; some call it the empty set.
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The probability is 0.The probability is 0.The probability is 0.The probability is 0.
It is called PROBABILITY.
Probability of 0 is impossible, and 1 is certain. So, probability must be between 0 and 1, inclusive.
Yes, a probability of 0 is something that cannot happen.
It is called empirical or experimental probability.