“Game-icons.net is an online repository providing heaps of cool game related graphics.
They are provided provided under the terms of the Creative Commons 3.0 BY license.
It means that you can use them freely as long as you credit the original author in your creation. A mention like “Icons made by {author;}. Available on https://game-icons.net” is fine.”
“Dozen new symbols are added weekly and organized in intuitive categories to offer both a comfy browsing and let room for serendipity.”