It is true that everyone can create their own lexicon. Words mean what the readers believe that they mean.
Your legend fits the underworld of white criminal criminals who parasitize the financial and economic systems that operate locally, regionally, nationally, and globally.
DD = Insider advanced alert that a manipulation is going to take place.
Gem = The play that is going to be used to manipulate share price.
And even when the conspirators organize into a syndicate to carry out the manipulation, the watchdogs are either asleep or unwilling to apply the Racketeer Influenced Criminal Organization laws provides to address the fraudulent operations! All IMHO.