data structure:primitive type
Boolean, true or false.
Character
Floating-point representation of a finite subset of the rationals.
Including single-precision and double-precision IEEE 754 floats, among others
Fixed-point representation of the rationals
Integer, a direct representation of either the integers or the non-negative integers
Reference, sometimes erroneously referred to as a pointer or handle, is a value that refers to another value, possibly including itself
Symbol, a unique identifier
Enumerated type, a set of symbols
Complex, representation of complex numbers