Secret signal

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Possible Answers: CODE.

Random information on the term “CODE”:

Crude Oil Data Exchange (CODE) is an electronic business standard sanctioned by the American Petroleum Institute.[1] CODE was initially implemented as the standard in 1978. It provides field formats and record layouts to facilitate the transmission of crude oil run tickets between producers and transporters. Oil statement records were added to the system in January 1986. In 1989, tank increment records were added to the standard.[2]
Taken from Wikipedia