What is LGG/LG gold system? are they the same terms?

Sorry i'm new and i have been browsing the forums and have seen like "i trade you for 20k LG for this account"
i didnt understad if it was a game currency of somesort, i have of a bit of idea but not the whole thing onfused:

No more LGG im sorry

It was forum gold you got from posting. It's gone now, tho.

LGG(Logicalgamers Gold) was use as a "every game currency" throughout the site.