What is the name of the net thing to increase your yield?

i could have swore the name of it was a trellis, but cant seem to remember, any help? please and thank you

You mean like? Screen used in scrog?
to place over your plants so they weave through them... Its essentially any large net...

http://www.thehydrosource.com/index.php?main_page=advanced_search_result&search_in_description=1&search_normal=yes&keyword=trellis+netting
I think scroging is pretty much the same thing, you might get better results using a metal or plastic net rather then polyester(could leave strings behind on your buds).

Trellis netting..... 5' x 15' ... Home Depot... $4.95