<font-awesome-icon icon="fa-brands fa-bluetooth-b" />
<FontAwesomeIcon icon="fa-brands fa-bluetooth-b" />
.my-icon::before {
font: var(--fa-font-brands);
content: "\f294";
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512" style="width: 30px;height: 30px;fill: black">
<path d="M196.5 260l92.63-103.3L143.1 0v206.3l-86.11-86.11-31.41 31.41 108.1 108.4L25.61 368.4l31.41 31.41 86.11-86.11L145.8 512l148.6-148.6-97.91-103.3zm40.86-102.1l-49.98 49.98-.338-100.3 50.31 50.32zM187.4 313l49.98 49.98-50.31 50.32 .338-100.3z"/>
</svg>
<i class="fa-brands fa-bluetooth-b"></i>