sigmoid sinus: an S-shaped dural sinus on the temporal and occipital bones
venous sinus: a wide channel containing blood; does not have the coating of an ordinary blood vessel
foreign intelligence surveillance court: a secret federal court created in 1978 by the Foreign Intelligence Surveillance Act; responsible for authorizing wiretaps and other forms of electronic surveillance and for authorizing searches of suspected spies and terrorists by the Department of Justice or United States intelligence agencies