A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, tableColumnBefore } from '@wordpress/icons';
<Icon icon={tableColumnBefore} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="-2 -2 24 24" aria-hidden="true" focusable="false"><path d="M6.4 3.776v3.648H2.752v1.792H6.4v3.648h1.728V9.216h3.712V7.424H8.128V3.776zM0 17.92V0h20.48v17.92H0zM12.8 1.28H1.28v14.08H12.8V1.28zm6.4 0h-5.12v3.84h5.12V1.28zm0 5.12h-5.12v3.84h5.12V6.4zm0 5.12h-5.12v3.84h5.12v-3.84z"></path></svg>
tableColumnBefore – WordPress Icon Library