<font-awesome-icon icon="fa-brands fa-black-tie" />
<FontAwesomeIcon icon="fa-brands fa-black-tie" />
.my-icon::before {
font: var(--fa-font-brands);
content: "\f27e";
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" style="width: 30px;height: 30px;fill: black">
<path d="M0 32v448h448V32H0zm316.5 325.2L224 445.9l-92.5-88.7 64.5-184-64.5-86.6h184.9L252 173.2l64.5 184z"/>
</svg>
<i class="fa-brands fa-black-tie"></i>