A term used in graph theory.
A node is an entity in a graph which is connected to zero or more other nodes by zero or more arcs. The nodes of a graph denote the entities we are interested in, while the arcs denote the structural relationships (connections) between them.
In CG theory
In conceptual graph-theory, the nodes are of two types:
Other examples of nodes include:
A term in Prolog.
A numeric constant is simply a number. It must either be an integer or a real number. A real number can be taken in this context to be a number with a decimal fraction.
For example, the following are all numeric constants:
The first three are integers, while the last three are real numbers.