Certain investment is a term used to describe investments that are considered to be reliable and secure. Muni, EBond, and REALESTATE are all examples of certain investments. Muni is an abbreviation for municipal bonds, which are debt securities issued by a state, municipality, or county to finance its capital expenditures. EBond is an abbreviation for electronic bonds, which are bonds that are bought and sold electronically. REALESTATE is an investment in physical property, such as land or buildings.