What is the cross over t called?

The term "crossover t" is not a standard term in any field of study that I am aware of. It's possible that you're referring to a specific concept in a particular context, but without more information, it's difficult to say for sure.

Could you please provide some context or clarify what you mean by "crossover t"? For example:

* What field are you referring to? (e.g., statistics, genetics, electronics, etc.)

* What is the context of the term? (e.g., a specific formula, graph, or diagram)

* What are you trying to understand about "crossover t"? (e.g., its meaning, calculation, significance, etc.)

With more information, I can help you find the correct term or provide a more accurate explanation.