A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, tableRowBefore } from '@wordpress/icons';
<Icon icon={tableRowBefore} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="-2 -2 24 24" aria-hidden="true" focusable="false"><path d="M6.656 6.464h2.88v2.88h1.408v-2.88h2.88V5.12h-2.88V2.24H9.536v2.88h-2.88zM0 17.92V0h20.48v17.92H0zm7.68-2.56h5.12v-3.84H7.68v3.84zm-6.4 0H6.4v-3.84H1.28v3.84zM19.2 1.28H1.28v9.024H19.2V1.28zm0 10.24h-5.12v3.84h5.12v-3.84zM6.656 6.464h2.88v2.88h1.408v-2.88h2.88V5.12h-2.88V2.24H9.536v2.88h-2.88zM0 17.92V0h20.48v17.92H0zm7.68-2.56h5.12v-3.84H7.68v3.84zm-6.4 0H6.4v-3.84H1.28v3.84zM19.2 1.28H1.28v9.024H19.2V1.28zm0 10.24h-5.12v3.84h5.12v-3.84z"></path></svg>
tableRowBefore – WordPress Icon Library