security issued not as a certificate but simply as an entry in a bank account. Most Treasury securities are book-entry.
book entry securities collateral - financial collateral provided under a financial collateral arrangement which consists of financial instruments, title to which is evidenced by entries in a register or account maintained by or on behalf of an intermediary
Without affecting the application of this Directive to directly-held securities, the location of book entry securities provided as financial collateral and held through one or more intermediaries should be determined.