Type of parameter

Primitive

Basic type parameters.

Type	Inspector	Description
Bool		Boolean
Enum		enum type (typable)
Float		Signed 32 bit floating point number
Int		Signed 32 bit integer
Long		Signed 64 bit integer
String		String

A list of basic type parameters.

Type	Inspector	Description
BoolList		List of boolean
EnumList		List of enum type (typable)
FloatList		List of signed 32 bit floating point number
IntList		List of signed 32 bit integer
LongList		List of signed 64 bit integer
StringList		List of string

An Object type parameter defined in Unity.

Type	Inspector	Description
AssetObject		Referece to AssetObject (typable)
Component		Referece to Component (typable)
GameObject		Reference to GameObject
RectTransform		Reference to RectTransform component
Rigidbody		Reference to Rigidbody component
Rigidbody2D		Reference to Rigidbody2D component
Transform		Reference to Transform component

A list of Object type parameters defined in Unity.

Type	Inspector	Description
AssetObjectList		List of referece to AssetObject (typable)
ComponentList		List of referece to Component (typable)
GameObjectList		List of reference to GameObject

Structure parameters defined in Unity.

Type	Inspector	Description
Bounds		An axis aligned bounding box.
BoundsInt		An axis aligned bounding box in which each component is an integer.
Color		Color
Quaternion		Quaternion
Rect		2D rectangle
RectInt		2D rectangle in which each component is an integer
Vector2		2 dimensional vector
Vector2Int		2 dimensional vector in which each component is an integer
Vector3		3 dimensional vector
Vector3Int		3 dimensional vector in which each component is an integer
Vector4		4 dimensional vector

A list of structure parameters defined in Unity.

Type	Inspector	Description
BoundsIntList		List of an axis aligned bounding box in which each component is an integer
BoundsList		List of an axis aligned bounding box
ColorList		List of color
QuaternionList		List of quaternion
RectIntList		List of 2D rectangle in which each component is an integer
RectList		List of 2D rectangle
Vector2IntList		List of 2 dimensional vector in which each component is an integer
Vector2List		List of 2 dimensional vector
Vector3IntList		List of 3 dimensional vector in which each component is an integer
Vector3List		List of 3 dimensional vector
Vector4List		List of 4 dimensional vector

A type parameter that can be defined by a script.

With Variable you can create your own parameters.