A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, fullscreen } from '@wordpress/icons';
<Icon icon={fullscreen} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M6 4a2 2 0 0 0-2 2v3h1.5V6a.5.5 0 0 1 .5-.5h3V4H6Zm3 14.5H6a.5.5 0 0 1-.5-.5v-3H4v3a2 2 0 0 0 2 2h3v-1.5Zm6 1.5v-1.5h3a.5.5 0 0 0 .5-.5v-3H20v3a2 2 0 0 1-2 2h-3Zm3-16a2 2 0 0 1 2 2v3h-1.5V6a.5.5 0 0 0-.5-.5h-3V4h3Z"></path></svg>
fullscreen – WordPress Icon Library