This is a variable node, used to retrieve the value of a variable.

If the value hasn't been previously written to by any of the other variable nodes, the resulting output will be 0.

This node is used in all modules.

Output #1 is a number - the value of the variable specified in the name option.

The Name option is the name of the variable you want to record. Make sure that your variable names exactly match any other variable node that wants to use the same value, including case.