Esso in the context of Milford Haven

Flit (stylized in all caps) was the brand name for an insecticide. The original product, invented by chemist Dr. Franklin C. Nelson and launched in 1923 and mainly intended for killing flies and mosquitoes, was mineral oil based and manufactured by the Standard Oil Company of New Jersey, before the company, now part of ExxonMobil, was renamed first Esso and later Exxon. The Esso formulation contained 5% DDT in the late 1940s and early 1950s, before the negative environmental impact of DDT was widely understood. Later marketed as "Flit MLO", it has since been discontinued. A hand-operated atomizer called a Flit gun was commonly used to perform the spraying.

The Flit brand name has been reused for another insecticide product, with the primary active ingredient of permethrin, marketed by Clarke Mosquito Control. The current product is most often used to control adult mosquitoes. Spraying it into the air kills adult mosquitoes that are present and then by settling onto surfaces it kills mosquitoes that may later land.

The sea-level curve (also known as the eustatic curve) is the representation of the changes of the sea level relative to present day mean sea level as gleaned from the stratigraphic record throughout the geological history.

The first such curve is the Vail curve or Exxon curve. The names of the curve refer to the fact that in 1977 a team of Exxon geologists from Esso Production Research headed by Peter Vail published a monograph on seismic stratigraphic principles and global (eustatic)) sea-level changes. Their sea-level curve was based on seismic and biostratigraphic data accumulated during petroleum exploration.