The scroll with INRI on it represents what was nailed to the cross above Jesus’ head. INRI represents the four initial letters of‘Jesus Nazaren us Rex Judaeorum,’ which is Latin for ‘Jesus of Nazareth, King of the Jews.’ Pilate had this title put on the cross. (John 19:19)
The monogram of the X and P are the first two letters for the word for Christ in Greek (XPIETOE).
Bells at church ring to call the faithful to worship. Also one hears bells to mark the coming of Christ in Communion during holy mass.
The keys are the ‘keys of the kingdom of heaven’ which Jesus gave to Peter. (Matthew 16:19)