Wind turbine rotor blade, with a leading edge, a trailing edge, a rotor blade root, a rotor blade tip, a suction side, a pressure side, a rotor blade length, a profile depth and a pitch axis of rotation, the profile depth decreasing along the rotor blade length from the rotor blade root to the rotor blade tip, the trailing edge having a trailing edge delimiting line, which replicates the contour of the trailing edge, the trailing edge having a plurality of serrations to improve flow behaviour at the trailing edge, the serrations respectively having a serration tip, two serration edges and an angle bisector (255a-255e), the serration edges being provided non-parallel to a direction of incident flow that is perpendicular to the pitch axis of rotation, the serration edges being non-perpendicular to a tangent to the trailing edge delimiting line, the trailing edge delimiting line having a plurality of portions, at least one of the portions extending non-parallel to the pitch axis of rotation, wherein the angle bisector (255a-255e) of each serration is non-perpendicular to the pitch axis of rotation, - each serration having at least two serration edges and - the trailing edge having a serration trailing edge delimiting angle (Φ E), which is defined by a serration edge and a direction of incident flow (A, A') provided normal to the trailing edge delimiting line, the serration trailing edge delimiting angle (Φ E) being less than 90°, wherein the serration trailing edge delimiting angle (Φ E) increases from the rotor blade root to the rotor blade tip in the case of the serration edges that point towards the rotor blade root or decreases from the rotor blade root to the rotor blade tip in the case of the serrations edges that point away from the rotor blade root. a leading edge, a trailing edge, a rotor blade root, a rotor blade tip, a suction side, a pressure side, a rotor blade length, a profile depth and a pitch axis of rotation, the profile depth decreasing along the rotor blade length from the rotor blade root to the rotor blade tip, the trailing edge having a trailing edge delimiting line, which replicates the contour of the trailing edge, the trailing edge having a plurality of serrations to improve flow behaviour at the trailing edge, the serrations respectively having a serration tip, two serration edges and an angle bisector (255a-255e), the serration edges being provided non-parallel to a direction of incident flow that is perpendicular to the pitch axis of rotation, the serration edges being non-perpendicular to a tangent to the trailing edge delimiting line, the trailing edge delimiting line having a plurality of portions, at least one of the portions extending non-parallel to the pitch axis of rotation, wherein the angle bisector (255a-255e) of each serration is non-perpendicular to the pitch axis of rotation, - each serration having at least two serration edges and - the trailing edge having a serration trailing edge delimiting angle (Φ E), which is defined by a serration edge and a direction of incident flow (A, A') provided normal to the trailing edge delimiting line, the profile depth decreasing along the rotor blade length from the rotor blade root to the rotor blade tip, the trailing edge having a trailing edge delimiting line, which replicates the contour of the trailing edge, the trailing edge having a plurality of serrations to improve flow behaviour at the trailing edge, the serrations respectively having a serration tip, two serration edges and an angle bisector (255a-255e), the serration edges being provided non-parallel to a direction of incident flow that is perpendicular to the pitch axis of rotation, the serration edges being non-perpendicular to a tangent to the trailing edge delimiting line, the trailing edge delimiting line having a plurality of portions, at least one of the portions extending non-parallel to the pitch axis of rotation, wherein the angle bisector (255a-255e) of each serration is non-perpendicular to the pitch axis of rotation, - each serration having at least two serration edges and - the trailing edge having a serration trailing edge delimiting angle (Φ E), which is defined by a serration edge and a direction of incident flow (A, A') provided normal to the trailing edge delimiting line, - each serration having at least two serration edges and - the trailing edge having a serration trailing edge delimiting angle (Φ E), which is defined by a serration edge and a direction of incident flow (A, A') provided normal to the trailing edge delimiting line, the serration trailing edge delimiting angle (Φ E) being less than 90°, wherein the serration trailing edge delimiting angle (Φ E) increases from the rotor blade root to the rotor blade tip in the case of the serration edges that point towards the rotor blade root or decreases from the rotor blade root to the rotor blade tip in the case of the serrations edges that point away from the rotor blade root.