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A door and/or window stopper includes two branches each having a contour tapering toward a tip and further includes a coupling body, which is at least partially made of rubber or a flexible, rubber-like thermoplastic material or elastomer, wherein at least outer surfaces of the branches have a relat

A door and/or window stopper includes two branches each having a contour tapering toward a tip and further includes a coupling body, which is at least partially made of rubber or a flexible, rubber-like thermoplastic material or elastomer, wherein at least outer surfaces of the branches have a relatively high friction coefficient. The two branches have inner surfaces, which are connected to each other in a connecting region and extend away from each other outward to tips of the branches. The two branches are connected to each other by way of a connecting body and disposed in a V-shaped manner. Proceeding from the respective tips, the outer surfaces of the branches extend at decreasing distances toward the coupling body.

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1. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V

1. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions is orthogonal to said first plane and has a relatively high friction coefficient;wherein said each one of the two branch portions has a first inner surface orthogonal to said first plane, said first inner surface being connected to the first inner surface of another of said two branch portions in a connecting region and extending away from the connecting region toward said tip;wherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions; andwherein a first distance between the tip of said one branch portion and the tip of said other branch portion is equal to a second distance from the tip of said one branch portion to a distal end of said body portion. 2. The stopper according to claim 1, wherein at least a first length portion of said inner surface is convex, and wherein at least a first length portion of said outer surface is concave. 3. The stopper according to claim 1, wherein at least a first length portion of said inner surface is substantially planar, and wherein at least a first length portion of said outer surface is substantially planar. 4. The stopper according to either claim 1, wherein the two branch portions are configured so that a clearance between said inner surface of said one branch portion in a vicinity of said tip and said inner surface of said other branch portion in a vicinity of said tip can be changed by pressing the two branch portions together during insertion of the stopper into a gap, said clearance defining a retaining force which increases as the two branch portions are pressed closer together. 5. The stopper according to claim 1, wherein the connecting region is configured so that a movement of the connecting region toward the body portion increases a retaining force of the stopper. 6. The stopper according to claim 1, wherein the body portion has a width spanning from a side of the body portion at said one branch portion to an opposite side of the body portion at said other branch portion, wherein the body portion has a length along an axis toward the connection region, said length of said body portion being greater by a predetermined factor than a width of said one branch portion at a location of said one branch portion extending from said body portion. 7. The stopper according to claim 6, wherein the factor is from 1.5 to 3.5. 8. The stopper according to claim 6, wherein the factor is from 2 to 2.5. 9. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions is orthogonal to said first plane and has a relatively high friction coefficient;wherein said each one of the two branch portions has a first inner surface orthogonal to said first plane, said first inner surface being connected to the first inner surface of another of said two branch portions in a connecting region and extending away from the connecting region toward said tip;wherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions; andwherein a first distance between the connecting region and a distal end of the body portion is at least as long as a second distance between the connecting region and the tip of said one of the two branch portions. 10. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions located between said first edge and second edge is orthogonal to said first plane and has a relatively high friction coefficient;wherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions;wherein a first distance between the tip of said one branch portion and the tip of said other branch portion is equal to a second distance from the tip of said one branch portion to a distal end of said body portion; andwherein each said one branch portion is solid for a length portion extending from said tip to an inner-peripheral surface vertex of said V-shape. 11. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions is orthogonal to said first plane and has a relatively high friction coefficient;wherein said each one of the two branch portions has a first inner surface orthogonal to said first plane, said first inner surface being connected to the first inner surface of another of said two branch portions in a connecting region and extending away from the connecting region toward said tip; andwherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions; andthe stopper further comprising a V-shaped cavity having a base wall formed by said body portion and having branch walls extending as inner surfaces of said each one branch portion toward the tip of said each one branch portion. 12. The stopper according to claim 11, wherein in a direction parallel to said first plane, a first thickness of said each one branch portion decreases along a length of said one branch portion toward said tip. 13. The stopper according to claim 11, wherein said each one branch portion comprises an inner material and an outer material covering the inner material, and wherein the inner material is more rigid than the outer material. 14. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions is orthogonal to said first plane and has a relatively high friction coefficient;wherein said each one of the two branch portions has a first inner surface orthogonal to said first plane, said first inner surface being connected to the first inner surface of another of said two branch portions in a connecting region and extending away from the connecting region toward said tip; andwherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions; andthe stopper further comprising a respective reinforcing member disposed within each one of said two branch portions. 15. The stopper according to claim 14, further comprising a connecting arm connecting the reinforcing member of said each one branch portion. 16. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions is orthogonal to said first plane and has a relatively high friction coefficient;wherein said each one of the two branch portions has a first inner surface orthogonal to said first plane, said first inner surface being connected to the first inner surface of another of said two branch portions in a connecting region and extending away from the connecting region toward said tip;wherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions; andwherein in a direction normal to said first plane, a second thickness of said each one branch portion increases along a length of said one branch portion toward said tip. 17. A door and/or window stopper made at least partially of rubber or a flexible, rubber-like thermoplastic material or elastomer and comprising: a body portion; andtwo branch portions that are coplanar in a first plane and are connected to each other by the body portion so that the stopper forms a V-shape;wherein each one of the two branch portions tapers toward a tip;wherein an outer surface of said each one of said two branch portions is orthogonal to said first plane and has a relatively high friction coefficient;wherein said each one of the two branch portions has a first inner surface orthogonal to said first plane, said first inner surface being connected to the first inner surface of another of said two branch portions in a connecting region and extending away from the connecting region toward said tip;wherein for each said one of said two branch portions, proceeding from the tip toward the coupling body, the outer surface of said one of the two branch portions extends, along at least a partial length of said outer surface, toward another of the two branch portions; andwherein for each said one branch portion between said outer surface and said inner surface is a facing surface and an adjacent bevel edge surface, the bevel edge surface being of predetermined height relative to said adjacent facing surface. 18. The stopper according to claim 17, wherein said predetermined height is from 0.5 to 2 mm. 19. The stopper according to claim 17, wherein said predetermined height is from 1 to 1.5 mm.