It's possible you're thinking of a different word or prefix, such as:
* "Pont" might be a misspelling of "point", which is a common prefix meaning "a specific location, a dot, or a sharp end".
* "Pon-" is not a recognized prefix in English. It might be a part of a foreign word or a made-up word.
Please provide more context about where you encountered this "pont" prefix so I can help you understand it better.