These are non-negotiable securities, which means that they cannot be bought and sold on the secondary market but only through the US government for payment. They share similar features to TIPS because they adjust for inflation and are default-free.
CFP® certification is a voluntary certification granted in the United States by Certified Financial Planner Board of Standards, Inc. It is recognized in the United States and a number of other countries for its (1) high standard of professional education; (2) stringent code of conduct and standards of practice; and (3) ethical requirements that govern professional engagements with clients. Individuals who become certified are required to complete continuing education.