When you are trying to decide if something meets criteria, you often need to go back to the main three tenets listed here: Niantic Wayfarer
Must meet at least one of the three eligibility criteria
- A great place for exploration
- A great place for exercise
- A great place to be social with others
It would not be possible to make a clarification on every single sign possible. There is one here that may help you with some of these:
But instead of looking for a precedent for each object you want to submit, you should think about whether you can make a case that it is a great place for exercise, exploration, or being social. For example, a park name sign would represent a great place for all three criteria, but a park rules sign would not encourage any of those.