How do you spell a per po?

"Per po" is not a standard English word or phrase. It's likely a misspelling or abbreviation for something else.

To help me understand what you're looking for, could you please provide more context or information?

For example:

* What are you trying to say?

* What is the full sentence or phrase?

* Where did you see this?

Once I have more information, I can help you spell it correctly.