The term "polygonal cell" is not a standard term in biology or any other scientific field. It's likely you've encountered this term in a specific context.

To help you understand what you might be looking for, could you please provide more information?

For example:

* Where did you see this term? (e.g., a textbook, scientific paper, website)

* What was the context? (e.g., cell type, function, location)

* Are there any other terms used in conjunction with "polygonal cell"?

Once I have this information, I can help you identify the source of the term and its meaning.