A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, addCard } from '@wordpress/icons';
<Icon icon={addCard} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M18.5 5.5V8H20V5.5h2.5V4H20V1.5h-1.5V4H16v1.5h2.5zM12 4H6a2 2 0 00-2 2v12a2 2 0 002 2h12a2 2 0 002-2v-6h-1.5v6a.5.5 0 01-.5.5H6a.5.5 0 01-.5-.5V6a.5.5 0 01.5-.5h6V4z"></path></svg>
addCard – WordPress Icon Library