These first tests should be showing a single “icon” element each, but none of them are visible:
Fontello uploaded logo SVG
Icomoon uploaded SVG
Fontello test with Fontawesome
Testing with a list
Here is an icon list:
This is using the "check" from the default icons
This one is using the "paxme" set created with Fontello from a svg file
This one was supposed to use the set created with Icomoon from svg files downloaded from a Flaticon icon set, but those didn't even show up so none could be selected
This one is using a test set created with Fontello by selecting some "medical" fontawesome icons
This one is using an iconmoon set created with the logo svg