Blade (7; 7') of a turbocharger with variable turbine geometry, which turbocharger has a turbine housing with an exhaust-gas inlet opening and with an exhaust-gas outlet opening, in which turbine housing there is arranged a turbine wheel fastened on a shaft, wherein the blade comprises the following: • a blade underside (8; 8') and a blade top side (9; 9'), which define the blade thickness, wherein the blade top side (9; 9') has both concave and convex portions, • a blade leading edge (10; 10') at a first intersection of the blade underside (8; 8') and the blade top side (9; 9'), • a blade trailing edge (11; 11') at a second intersection of the blade underside (8; 8') and the blade top side (9; 9'), and • a profile centreline (12; 12') which is defined by the blade underside (8; 8') and the blade top side (9; 9') and which runs between these from the blade leading edge (10; 10') to the blade trailing edge (11; 11'), wherein • the course of the profile centreline (12; 12') is undulating with two opposing antinodes (12A, 12B), characterized • in that one of the antinodes of the profile centreline (12; 12') plotted on an X-Y coordinate system whose X-axis constitutes the blade length of the blade (7; 7') is a region which begins at the blade leading edge (10, 10') and which has negative Y values between the blade leading edge and a zero crossing of the profile centreline through the X axis, and in that the second of the antinodes of the profile centreline (12; 12') is a region which always has positive Y values proceeding from the zero crossing of the profile centreline (12; 12') through the X axis to the blade trailing edge; • wherein the blade leading edge is situated at X=0 and the blade trailing edge is situated at X=1; and • wherein the zero crossing is situated in a region from X=0.2 to X=0.4. • a blade underside (8; 8') and a blade top side (9; 9'), which define the blade thickness, wherein the blade top side (9; 9') has both concave and convex portions, • a blade leading edge (10; 10') at a first intersection of the blade underside (8; 8') and the blade top side (9; 9'), • a blade trailing edge (11; 11') at a second intersection of the blade underside (8; 8') and the blade top side (9; 9'), and • a profile centreline (12; 12') which is defined by the blade underside (8; 8') and the blade top side (9; 9') and which runs between these from the blade leading edge (10; 10') to the blade trailing edge (11; 11'), wherein • the course of the profile centreline (12; 12') is undulating with two opposing antinodes (12A, 12B), characterized • in that one of the antinodes of the profile centreline (12; 12') plotted on an X-Y coordinate system whose X-axis constitutes the blade length of the blade (7; 7') is a region which begins at the blade leading edge (10, 10') and which has negative Y values between the blade leading edge and a zero crossing of the profile centreline through the X axis, and in that the second of the antinodes of the profile centreline (12; 12') is a region which always has positive Y values proceeding from the zero crossing of the profile centreline (12; 12') through the X axis to the blade trailing edge; • wherein the blade leading edge is situated at X=0 and the blade trailing edge is situated at X=1; and • wherein the zero crossing is situated in a region from X=0.2 to X=0.4.