This is a representation of the coat of arms of the Personal Ordinariate of Our Lady of the Southern Cross.
The following Commons images were used to create this image:

 File:Roman Catholic Diocese of Erie.svg by Niagara (talk · contribs) (mitre)
 File:Old French Escutcheon.svg by Masur (talk · contribs)
 File:Blason région fr Alsace.svg by SanchoPanzaXXI (talk · contribs)
 File:Escudo de Millanes (Cáceres).svg by Ivanics (talk · contribs)
Own work
Alekjds