mkdocs-material/material/.icons/fontawesome/solid/border-all.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M384 96v128H256V96h128zm0 192v128H256V288h128zm-192-64H64V96h128v128zM64 288h128v128H64V288zm0-256C28.7 32 0 60.7 0 96v320c0 35.3 28.7 64 64 64h320c35.3 0 64-28.7 64-64V96c0-35.3-28.7-64-64-64H64z"/></svg>