What makes Phosphor Icons special is its flexibility and the wide variety of styles available. Plus, it's a free and open source initiative, meaning anyone can use it and contribute to its development.
I'm been using Phosphor Icons for a few month now on my personal project and it's just what I was looking for a very long time. The minimalist in myself loves it and the website is go straight to the point and is neat.
The attention to detail at 16x16 pixels is impressive—it scales beautifully across screen sizes without losing clarity. Bonus: it’s free and open-source. This is a must-have in every creative’s toolkit!