@tkeil69575@bvdputte is right. We use a licensed icon set called Nucleo. But the license is not too expensive and the icons can afterwards be used in any of your own projects: https://nucleoapp.com/
Ah, okay, thank you both - that’s def. good to know. However, my question was more aimed at the technical side, as the orginal poster had asked about how to use <k-icon type="file-document"> … so, how do you use that? and can it also be used outside of the panel?
Our Panel is based on Vue and has its own UI component kit. You can use and extend all our components in your Panel plugins for a super fast and consistent developer experience.