According to some researchers, the double Xs found on the Exxon logo is a reference to the double cross, or the Cross of Lorraine as used in freemasonry, and worn by the Knight Templars during the crusade by permission of the King of Jerusalem.
The oil and gas supergiant is a descendant of J.D. Rockefeller’s Standard Oil. In 1999 it merged with another descendent of Standard Oil, Mobil, to form ExxonMobil. The Cross of Lorraine remained.