Love the question @HSDad22. Can't wait for you to get an answer....
I suspect you won't get a specific answer to "the real strikezone you are directed to call" because it is evolving. My oldest son and I were talking about this during super regionals. As a follow up, I started reading a dozen or so articles on the the topic. In my opinion, there is a difference between "in-theory" and "execution", and I don't know why. The current NCAA strike zone policy is noted below. The hollow beneath the knee cap is pretty straight forward. What is a little murky to me is the midpoint definition. That needs to be more clearly defined.
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According to NCAA rules (today), the strike zone "starts from the bottom of the kneecaps to the midpoint between the top of the shoulders and the top of the uniform pants." The strike zone depends on the batter's stance while preparing for a swing at a pitched ball.
