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London System is a chess opening that arises after 1.d4 Nf6 2.Nf3 g6 3.Bf4. It is classified A48 in the ECO system, and the position after these moves has black to move.
This position can also be reached by 2 other move orders, including 1.d4 Nf6 2.Nf3 g6 3.Bf4 Bg7 4.e3.
Each of these is a named opening reached by playing on from 1.d4 Nf6 2.Nf3 g6 3.Bf4. Open any of them to load the position on the board.