<font-awesome-icon icon="fa-regular fa-a" />
<FontAwesomeIcon icon="fa-regular fa-a" />
.my-icon::before {
font: var(--fa-font-regular);
content: "\41";
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512" style="width: 30px;height: 30px;fill: black">
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</svg>
<i class="fa-regular fa-a"></i>