Right Of Representation
The term “right of representation” comes to us from 600 years of the English common law. It means that if the person that you designate to receive a benefit under your will or trust dies before you or with you, then the share that they would have taken will go down to their children. So, if they were entitled to a 25 percent share of your estate, and they died with you, and they had three children, their three children would step up and represent their parent and take the 25 percent in equal shares among them.
Found here in the Glossary https://www.musthavedocuments.com/other/glossary