<font-awesome-icon icon="fa-light fa-ankh" />
<FontAwesomeIcon icon="fa-light fa-ankh" />
.my-icon::before {
font: var(--fa-font-light);
content: "\f644";
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512" style="width: 30px;height: 30px;fill: black">
<path d="M304 288h-88.63C252.3 252 288 191.6 288 137.1C288 53 230.8 0 160 0S32 53 32 137.1C32 191.6 67.75 252 104.6 288H16C7.199 288 0 295.2 0 304S7.199 320 16 320h128v176c0 8.801 7.199 16 16 16s16-7.199 16-16V320h128c8.801 0 16-7.199 16-16S312.8 288 304 288zM160.3 288C139.4 286.1 64 208.9 64 137.1C64 75.25 103.5 32 160 32s96 43.25 96 105.1C256 208.9 180.8 286.1 160.3 288z"/>
</svg>
<i class="fa-light fa-ankh"></i>