What is transport prefix?

"Transport prefix" isn't a standard term in any specific field. It's possible you've encountered it in a specific context, or it could be a misunderstanding.

To better understand what you mean, could you please provide more context? For example:

* Where did you see the term "transport prefix"? (e.g., a book, article, software documentation, etc.)

* What was the surrounding text about?

* What is the context of your question?

With more information, I can provide a more accurate answer.