Uh, from what I've learned through my Computer Integrated Manufacturing class I believe the proper name for this is just NC Code, with NC standing for Numerical Control. NC Code consists of G, M, and other codes necessary for CNC machine operation. A file containing an entire NC code program is often simply referred to as an NC File.
A google search yielded the following glossaries:
http://www.icam.com/icam/products/glossary.htm
http://microsystemsgeorgia.com/cnc.htm