http://en.wikipedia.org/wiki/Bearer_bond
"A bearer bond is a debt security issued by a business entity, such as a corporation, or by a government. It differs from the more common types of investment securities in that it is unregistered – no records are kept of the owner, or the transactions involving ownership. Whoever physically holds the paper on which the bond is issued owns the instrument. This is useful for investors who wish to retain anonymity. The downside is that in the event of loss or theft, bearer bonds are extremely difficult to recover."
http://www.proz.com/kudoz/english_to_portuguese/other/189187...