A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, addTemplate } from '@wordpress/icons';
<Icon icon={addTemplate} />
<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false"><path fill-rule="evenodd" clip-rule="evenodd" d="M18.5 5.5V8H20V5.5H22.5V4H20V1.5H18.5V4H16V5.5H18.5ZM13.9624 4H6C4.89543 4 4 4.89543 4 6V18C4 19.1046 4.89543 20 6 20H18C19.1046 20 20 19.1046 20 18V10.0391H18.5V18C18.5 18.2761 18.2761 18.5 18 18.5H10L10 10.4917L16.4589 10.5139L16.4641 9.01389L5.5 8.97618V6C5.5 5.72386 5.72386 5.5 6 5.5H13.9624V4ZM5.5 10.4762V18C5.5 18.2761 5.72386 18.5 6 18.5H8.5L8.5 10.4865L5.5 10.4762Z"></path></svg>
addTemplate – WordPress Icon Library