Here are some possibilities:
* A school of philosophers: This is a common term to describe a group of philosophers who share a common set of ideas or principles.
* A circle of philosophers: This suggests a group of philosophers who regularly discuss ideas and engage in intellectual discourse.
* A gathering of philosophers: This is a general term that could be used for any group of philosophers.
Ultimately, the best term to use depends on the specific context and the nature of the group of philosophers.