Silhouette crossed firefighters axes Royalty Free Vector Contradiction Math Symbol. Ⓡ or ⓟ or ⓒ. Silhouette crossed firefighters axes Royalty Free Vector Ⓡ or ⓟ or ⓒ. Ⓡ or ⓟ or ⓒ. Ⓡ or ⓟ or ⓒ.