This is a representation of the official heraldic coat of arms of the Roman Catholic Diocese of Phoenix showing the phoenix bird rising from the flames. According to the official description, "These arms are composed of a blue field on which is placed a silver (white) mountain to represent Camelback Mountain, a significant aspect of the backdrop of the See City. Arising from the mountain as a gold (yellow) bird that is coming forth from red flames to represent the mythological phoenix, that arose from the ashes, and for which the See City of Phoenix is named. Above the phoenix is a gold “cross formy fitchée (three arms of a cross and one resembling a spike), which is taken from the arms of the Diocese of Tucson to signify that it was from the territory of Tucson that the Diocese of Phoenix was carved in 1969." Ecclesiastical heraldry
http://www.diocesephoenix.org
original based on screenshot from the official page of the Diocese of Phoenix