CNC Milling machine. Notice that you can read and understand it. N5G00G20G17G90G40G49G80 N6G00G28Z0.0 N7G49 N8T1M06 ( End mill ) N9G43Z1.9685H1 N10S1000M03 N11G94 N12M08 These are all "getting started" codes. Notice that all the lines start with N followed by a number. This is simply the line number and is more for you than for the CNC machine.