The term 'Big Name in Petroleum' refers to four major companies in the OIL and gas industry: AMOCO (5 letters), HESS (4 letters), ARCO (4 letters), and OIL (3 letters). AMOCO, which stands for the American OIL Company, is a major OIL and gas company that was founded in 1889 and is now part of BP. HESS is an American OIL and gas company that was founded in 1933 and is now based in New York City. ARCO, which stands for Atlantic Richfield Company, is an American OIL and gas company that was founded in 1966 and is now owned by BP. Lastly, OIL is an acronym for OIL India Limited, an Indian state-owned OIL and gas company that was founded in 1959.