I think it’s implying the piece that was on g file is now being placed on e2.
chess notation ge2
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When you have two(of the same piece) that can go to the same square (e2 eg) then you need to specify which piece. For example. You have knight on c3 and knight on g1. Both knights can go to e2. You play Nge2. If you didnt move that knight but the other one: then Nce2. That is the notation that is used.
sigma
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C.10 If two identical pieces can move to the same square, the piece that is moved is indicated as follows:
C.10.1 If both pieces are on the same rank by:
C.10.1.1 The abbreviation of the name of the piece,
C.10.1.2 The file of departure, and
C.10.1.2 The square of arrival.
C.10.2 If both pieces are on the same file by:
C.10.2.1 The abbreviation of the name of the piece,
C.10.2.2 The rank of the square of departure, and
C.10.2.3 The square of arrival.
C.10.3 If the pieces are on different ranks and files, method 1 is preferred. Examples:
C.10.3.1 There are two knights, on the squares g1 and e1, and one of them moves to the square f3: either Ngf3 or Nef3, as the case may be.
C.10.3.2 There are two knights, on the squares g5 and g1, and one of them moves to the square f3: either N5f3 or N1f3, as the case may be.
C.10.3.3 There are two knights, on the squares h2 and d4, and one of them moves to the square f3: either Nhf3 or Ndf3, as the case may be.
C.10.3.4 If a capture takes place on the square f3, the notation of the previous examples is still applicable, but an x may be inserted: 1) either Ngxf3 or Nexf3, 2) either N5xf3 or N1xf3, 3) either Nhxf3 or Ndxf3, as the case may be.'
What is the g in ge2 when you move your knight in front of your king? I thought the n was the abbreviation for the knight.