Reversed/Black London System
A system/setup opening that can be played against anything white does(besides against 1.e4). There are some tricky lines and memorization for black against the queens gambit, other than that its the same setup each game. the setup is exactly like the normal london system except of Bd6 play Be7, its more accurate when playing the London as black.
Image credit: Alex Banzea youtube video on the reverse london system