Where and how is bootstrap image stored?

Question

I downloaded the bootstrap template, but I can't figure out where the images are stored smile and tachometer. I have not found them among other svg images or other format.

It seems to me they are stored somehow differently, but a search on fa-tachometer-alt shows me the css files. Perhaps the image is drawn through css. But I don't understand how this is done?

Answer 1

Thats not an image itself its a webfont called font-awesome