Venetian blind made from a plurality of slats, each slat having a z-shaped contour at least on the slats' upper sides, wherein the partial faces of the z-shaped contour are angularly displaced relative to each other, and each slat upper side comprises at least three partial faces, wherein between first partial faces (14 - 17) disposed to outside serve as reflectors for the high angles of incidence and second partial faces situated to inside (18 - 21) at least one further, central barshaped, straight or arched third connecting partial faces (22 - 25) are disposed, and that a tangent t 1 at the end point of the partial faces disposed to outside, and a tangent t 2 at the endpoint of the partial faces situated towards the inside to central partial faces or a connecting line between the partial faces (15, 19) form an angle β 1 with tangent t 1 and β 2 with tangent t 2, and whereby at least parts of the upper sides of the slats are made metallic-reflective, characterized in - first partial faces (14 - 17) disposed to outside serve as reflectors for the high angles of solar incidence and second partial faces (18 - 21) serve for re-directing daylight to inside, and the first (14 - 17) and second partial faces (18 - 21) are disposed spatially and angularly displaced relative to each other, and - that the first partial faces (14 - 17) disposed to outside are arranged in a larger angle (α 1) to a connecting line between endpoints (30, 31), and the partial faces (18 - 21) situated towards the inside are arranged in a smaller angle (α 2) to a connecting line between endpoints (30, 31), and - that the chords (V 1 and V 2) connecting the endpoints (31, 32) of the partial faces (14 - 17) disposed to outside and the endpoints (30, 33) of the partial faces (18 - 21) situated to inside form an acute angle ε 1 on the incidence side, and - the chords V 1 between the end points (31, 32) of the partial faces (14-17 and the chords V 2 between the endpoints (30, 33) of the partial faces (18 - 21) and a chord, between the edges disposed to outside and the edges disposed to inside of the slats, angles α 1 with chord V 1 and α 2 with chord V 2 will be obtained, wherein α 1 > α 2. - first partial faces (14 - 17) disposed to outside serve as reflectors for the high angles of solar incidence and second partial faces (18 - 21) serve for re-directing daylight to inside, and the first (14 - 17) and second partial faces (18 - 21) are disposed spatially and angularly displaced relative to each other, and - that the first partial faces (14 - 17) disposed to outside are arranged in a larger angle (α 1) to a connecting line between endpoints (30, 31), and the partial faces (18 - 21) situated towards the inside are arranged in a smaller angle (α 2) to a connecting line between endpoints (30, 31), and - that the chords (V 1 and V 2) connecting the endpoints (31, 32) of the partial faces (14 - 17) disposed to outside and the endpoints (30, 33) of the partial faces (18 - 21) situated to inside form an acute angle ε 1 on the incidence side, and - the chords V 1 between the end points (31, 32) of the partial faces (14-17 and the chords V 2 between the endpoints (30, 33) of the partial faces (18 - 21) and a chord, between the edges disposed to outside and the edges disposed to inside of the slats, angles α 1 with chord V 1 and α 2 with chord V 2 will be obtained, wherein α 1 > α 2.