It's a Memorial in Jerusalem for the people who lost their lives in the Twin Towers on 9/11 and is actually made from some of the wreckage and includes the names of ALL the people who lost their lives.
TRANSLATION into English:
“This
metal remnant was taken from the remains of the Twin Towers, that imploded
on September 11th disaster. It was sent over to Israel by the City of New
York to be incorporated in this memorial. This metal piece, like the
entire monument, is a manifestation of the special relationship between
New York and Jerusalem.”
"9/11 Living Memorial Plaza" MORE INFO Wkipedia Link