A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, calendar } from '@wordpress/icons';
<Icon icon={calendar} />
<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false"><path d="M19 3H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zm.5 16c0 .3-.2.5-.5.5H5c-.3 0-.5-.2-.5-.5V7h15v12zM9 10H7v2h2v-2zm0 4H7v2h2v-2zm4-4h-2v2h2v-2zm4 0h-2v2h2v-2zm-4 4h-2v2h2v-2zm4 0h-2v2h2v-2z"></path></svg>
calendar – WordPress Icon Library