A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, layout } from '@wordpress/icons';
<Icon icon={layout} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M18 5.5H6a.5.5 0 00-.5.5v3h13V6a.5.5 0 00-.5-.5zm.5 5H10v8h8a.5.5 0 00.5-.5v-7.5zm-10 0h-3V18a.5.5 0 00.5.5h2.5v-8zM6 4h12a2 2 0 012 2v12a2 2 0 01-2 2H6a2 2 0 01-2-2V6a2 2 0 012-2z"></path></svg>
layout – WordPress Icon Library