Webfont icons — what typographers would traditionally refer to as dingbats — are an important part of modern web development. There are so many advantages to them:

Comment:
I've used https://icomoon.io for years, because of its great selection of free icon fonts and also because it's quite easy to import self designed svgs and turn them into glyphs. It's easy to use and all relevant functionalities are free of charge.

https://web.dev/optimize-webfont-loading/#customize-the-text-rendering-delay