Jerusalem Shield

The simpler form of the cross is known as the "Crusaders' Cross", because it was on the papal bannergiven to the Crusadersby Pope Urban IIfor the First Crusade, and was a symbol of the Latin Kingdom of Jerusalem. The four smaller crosses are said to symbolize either the four books of the Gospelor the four directionsin which the Word of Christ spread from Jerusalem. Alternately, all five crosses can symbolize the five woundsof Christ during the Passion. This symbol is also used in the flag of Georgia.

Sometimes the larger cross is in the form of a cross potentor a cross crosslet, and in this configuration is referred to as the "Jerusalem Cross" proper.  (WIKIPEDIA – The Free Encyclopedia)