It would be very unusual to see such a signer on a certificate of deposit. However, an attorney in fact (an individual given a power of attorney) for the CD owner would be able to issue instructions relating to the account. In that sense, he or she could be considered a convenience signer.
BankingQuestions.com is a free service made possible by the generous support of our advertisers. Advertisers are not responsible for site content. Please help us keep BankingQuestions.com FREE by supporting our advertisers. When you see an ad for a product or service you may have an interest in, click through to learn more.