Hand-made noodles 'pulled' by a chef with his hands. That is how you make noodles. You pull them, then string them...... if you're ever in Vancouver, there's a place that shows you how it's done and you can eat the noodles there. I think the place is called Shaolin Noodle Restaurant on Broadway.
Other than that, you can use your imagination as to why they call it hand-pulled............