Mostly I've seen it for sale overseas, or from overseas to here.
I'll look for a good link, but it's from what is called the "fore end" which also has the pork shoulder (you know butt and picnic) and from what I remember, it's basically higher up, towards the backbone from the shoulder. You know need the neck/collar of the hog.
It's not another name for Shoulder/butt/picnic.
Just another way of selling us more of the hog.
Just like 5 years ago, most q'ers didn't know what a butt was (no laughing now) but today they do.