What does ARCO mean

I have seen this abbreviation many times since getting into the world of CNC. I see it all over the forums here.

But I have found NO place that tells me what the subject "ARCO" means.

So what in the pluperfect hallelujah does the 4 letters stand for? Any one?

I know, I know I am a novice and VERY new to CNC, but please tell this humble man what it means.

Thanks,

pat

 

Oops.

My bad. It is indeed ACRO; not ARCO. Sorry for that. Can you tell me what the letters mean?

Also; can one edit the title of a thread? I am very new to this forum.

Thank for correcting me Peter.

pat