**Feature Request** Build definition of pi into EE. ngspice does not include pi as a built in constant for use in general expressions (although is is available for use in expressions in Arbitrary sources!) Why is this feature important to you? ngspice does not include pi as a built in constant for use in general expressions (although is is available for use in expressions in Arbitrary sources!) pi is used extensively in RC and LC filter and many other calculations. In many situations the user has to add a `.param pi = 3.14159` statement to their simulation just to define pi. I have no idea why this is not already included in ngspice (I may try to raise a bug report for this at ngspice) but is there a way to do this automatically in EE so that the user does not have to add thier own definition every time they need to use pi?