Even though it is not documented in the Help file, the unary minus operator is supported in both Panorama X and in the previous Panorama 6. The unary plus operator is not supported (it produces a syntax error) and is really not of any practical use as far as I can tell anyway.
Here is an example of using the unary minus operator showing the negation of its operand’s value:
local myValue myValue = 1548.69 myValue = -myValue message myValue // output -1548.69 myValue = -myValue message myValue // output 1548.69
Not sure how often this would be used not being that mathematically adept but, nonetheless, it is an available tool for your use.