The Linear Momentum Operator is the quantum mechanical operator which gives an instruction to differentiate with respect to $x$ (position) and multiply by $-i\hbar$.
It has the following input:
It consists of differentiated values of $x$ multiplied by $-i\hbar$.
In the example below, the Linear Momentum Operator node inputs the values of $x$and applies the operation to a Gaussian function which results in a new function. The magnitudes of both the Gaussian and the resulting function after operator application are shown on the plot.