A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, postContent } from '@wordpress/icons';
<Icon icon={postContent} />
<svg xmlns="https://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M4 6h12V4.5H4V6Zm16 4.5H4V9h16v1.5ZM4 15h16v-1.5H4V15Zm0 4.5h16V18H4v1.5Z"></path></svg>
postContent – WordPress Icon Library