An Inverted Cross is a well known occulticsymbol used by satanists today & can be easily found for sale at occultic websites & stores. The upsidecross is a symbol that mocks the crucifixion of the Lord Jesus Christ. It can often be seen around the necks of heavy metal rock bands. Here, it's the Pope's backdrop.
This CNN Headline picture aired on TV showing the Pope ( JP II ) during his visit to Israel / March 2000.