### 13.1.1. Basic Terminology

The following is an example of a CCL object that defines an isosurface.

    ISOSURFACE: Iso1
       Variable = Pressure
       Value = 15000 [Pa]
       Color = 1,0,0
       Transparency = 0.5
    END

- `ISOSURFACE` is an object type

- `Iso1` is an object name

- `Variable = Pressure` is a parameter

- `Variable` is a parameter name

- `Pressure` is a parameter value

- If the object type does not need a name, it is called a singleton object. Only one object of a given singleton type can exist.

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