Difference between Standard Parallel and Parallel of Origin
I just googled it and according to the reasonably authoritative looking page I found, the parallel of origin is midway between the two standard parallels used to make a Lambert's Conformal.
It goes on to say that the scale is correct on the standard parallels and is smallest on the parallel of origin.
It goes on to say that the scale is correct on the standard parallels and is smallest on the parallel of origin.