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

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><!--! Font Awesome Free 6.2.0 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 2022 Fonticons, Inc.--><path d="M224 32c0-17.7-14.3-32-32-32s-32 14.3-32 32v112H48c-17.7 0-32 14.3-32 32s14.3 32 32 32h112v112c0 17.7 14.3 32 32 32s32-14.3 32-32V208h112c17.7 0 32-14.3 32-32s-14.3-32-32-32H224V32zM0 480c0 17.7 14.3 32 32 32h320c17.7 0 32-14.3 32-32s-14.3-32-32-32H32c-17.7 0-32 14.3-32 32z"/></svg>