Primitive
A primitive value is of a scalar or built-in type and may completely fit into a single memory location.
Related concepts: ValueTypeReference
Closest Wikipedia entry: Primitive data type — In computer science, primitive data type is either of the following: a basic type is a data type provided by a programming language as a basic building block. Most languages allow more complicated composite types to be recursively constructed starting from basic types. a built-in type is a data type for which the programming language provides built-in support.In most programming languages, all basic data types are built-in.