Just to elaborate on born_angry's answer:
A blue cage can be seen in the following photos,incase you are still
in the dark about what it is....
WWF (and other promotions) used this style cage for quite some time.
A triple cage (as BA said) is a 3 cage set-up,over one ring.It was used
by Kevin Sullivan a long time ago,and then seen (modernly) in both late
WCW (Arquette's match with DDP and Jarrett) and in WCW's Ready To
Rumble movie (also with Arquette and DDP).
War Games is the double ring,bigger cage,set-up.That was always WCW's
deal,and more recently was used by MLW in a less than average match....