Double Data Type
Double variables are stored as signed IEEE 64-bit (8-byte) double-precision floating-point numbers ranging in value from -1.79769313486231570E+308 through -4.94065645841246544E-324 for negative values and from 4.94065645841246544E-324 through 1.79769313486231570E+308 for positive values.
Note The Double data type can be converted to the Decimal data type without encountering a System.OverflowException error.
Appending the literal type character R to a literal forces it to the Double data type. Appending the identifier type character # to any identifier forces it to Double.
The equivalent .NET data type is System.Double.