What are these used for?

[BlueMoon]

In my block when I click "Variables" all my fields gets popped with P1, P2, P3, P4, P5....and so on like in the following screenshot. Can you tell me what is this used for?

[fxDreema]

Parameter 1, Parameter 2.... If used in those colorful field should give you the value of the parameters on the left. If you use P7, it will get the value from the "Profit amount" parameter, which is 0.

Basically the same idea as V1, V2 or C1, C2. But while "V" comes from Variable and "C" comes from Constant, "P" comes from Parameter