On September 11th there was a memorial service in Second Life. The names of all of those that died that fateful day were read. This is the memorial to the first responders that was unveiled after that service.
The text on the relief reads "Dedicated To Those That Fell and To Those Who Carry On....May We Never Forget".
If you want to visit the memorial inside Second Life, use the SLURL here.
None of us will forget Sept 11th, 2001.