It's possible that you are thinking of a different prefix, or that you have encountered "pon" in a specific context where it has a unique meaning.
Could you please provide more context? For example:
* Where did you encounter the prefix "pon"? (e.g., a word, a book, a website)
* What is the word it is attached to?
With more information, I can help you understand the meaning of "pon" in that specific context.