Registrar
The person or entity responsible for maintaining records on behalf of the issuer for the purpose of recording the names of the owners of registered bonds.
A Bond whose owner is designated on records maintained for this purpose by a Registrar, often the Paying Agent or Trustee. Transfers of the Bonds occurs only by a transfer on these records. The Principal and Interest on “fully registered” Bonds is paid directly by check (or other fund transfer) to the registered owner.
See Also
The person or entity responsible for maintaining records on behalf of the issuer for the purpose of recording the names of the owners of registered bonds.

Any use of Bond proceeds in a trade or business carried on by a person other than a governmental unit. The private business tests are used in part to establish whether a bond is a private activity bond (PAB).