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"T minus zero" means "out of time." This comes from a countdown convention used in by both the American military and NASA. Generally, it is used when counting down to a major event that will happen at a specific time. Mathematically, T is time, minus whatever amount of time is left until the event happens. If the News Years ball is dropping in 10 minutes, one could say "The ball is dropping in T minus 10 minutes and counting!" Therefore, "T minus zero" means that there is no time left.
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