A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, aspectRatio } from '@wordpress/icons';
<Icon icon={aspectRatio} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M18.5 5.5h-13c-1.1 0-2 .9-2 2v9c0 1.1.9 2 2 2h13c1.1 0 2-.9 2-2v-9c0-1.1-.9-2-2-2zm.5 11c0 .3-.2.5-.5.5h-13c-.3 0-.5-.2-.5-.5v-9c0-.3.2-.5.5-.5h13c.3 0 .5.2.5.5v9zM6.5 12H8v-2h2V8.5H6.5V12zm9.5 2h-2v1.5h3.5V12H16v2z"></path></svg>
aspectRatio – WordPress Icon Library