mkdocs-material/material/.icons/fontawesome/solid/square-minus.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.1.1 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="M384 32c35.3 0 64 28.65 64 64v320c0 35.3-28.7 64-64 64H64c-35.35 0-64-28.7-64-64V96c0-35.35 28.65-64 64-64h320zM136 232c-13.3 0-24 10.7-24 24s10.7 24 24 24h176c13.3 0 24-10.7 24-24s-10.7-24-24-24H136z"/></svg>