mkdocs-material/material/.icons/fontawesome/solid/l.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><!--! Font Awesome Free 6.2.1 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 2022 Fonticons, Inc.--><path d="M64 32c17.7 0 32 14.3 32 32v352h192c17.7 0 32 14.3 32 32s-14.3 32-32 32H64c-17.7 0-32-14.3-32-32V64c0-17.7 14.3-32 32-32z"/></svg>