Statutory law or statute law is written law (as opposed to oral
or customary law) set down by a legislature(as opposed to
regulatory law promulgated by the executive branch or common law of
the judiciary).
The Black letter law refers to the basic standard elements for a
particular field of law, which are generally known and free from
doubt or dispute.It may, for example, be the standard elements for
a contract or the technical definition of battery.