Carabiner for a rope, a strap and/or a further carabiner, comprising: - a main body having a 'C' configuration, between a lower free end and an upper free end which identify an inlet opening for the insertion of a cord or rope, the upper free end being provided with at least one protrusion , - a closing element , wedged in said lower free end and configured so as to elastically pass from a closing configuration, in which said lower free end and said upper free end connect together, so as to prevent the passage of the rope through the inlet opening , to an opening configuration in which it deviates at least partially from the protrusion of the upper free end so as to allow the passage of the rope through the inlet opening , - wherein the closing element comprises a first branch and a second branch , having a first lower interlocking end and a second lower interlocking end , respectively, interlocked to the lower free end of the main body , and a second upper closing end which, in a closing configuration, makes a shape coupling with said protrusion , - wherein said first branch and second branch are arranged in an X-shaped configuration, crossing at an intersecting point , on opposite sides with respect to a centreline plane (M-M) of the carabiner connecting the upper free end and the lower free end , - wherein the upper closing ends of said branches are connected to each other by means of an arc-shaped portion which at least partially embraces said protrusion , in a closing configuration, on the side of the main body , said arc-shaped portion also making a front undercut which opposes the rotation of the closing element on the side opposite the main body . - a main body having a 'C' configuration, between a lower free end and an upper free end which identify an inlet opening for the insertion of a cord or rope, the upper free end being provided with at least one protrusion , - a closing element , wedged in said lower free end and configured so as to elastically pass from a closing configuration, in which said lower free end and said upper free end connect together, so as to prevent the passage of the rope through the inlet opening , to an opening configuration in which it deviates at least partially from the protrusion of the upper free end so as to allow the passage of the rope through the inlet opening , - wherein the closing element comprises a first branch and a second branch , having a first lower interlocking end and a second lower interlocking end , respectively, interlocked to the lower free end of the main body , and a second upper closing end which, in a closing configuration, makes a shape coupling with said protrusion , - wherein said first branch and second branch are arranged in an X-shaped configuration, crossing at an intersecting point , on opposite sides with respect to a centreline plane (M-M) of the carabiner connecting the upper free end and the lower free end , - wherein the upper closing ends of said branches are connected to each other by means of an arc-shaped portion which at least partially embraces said protrusion , in a closing configuration, on the side of the main body , said arc-shaped portion also making a front undercut which opposes the rotation of the closing element on the side opposite the main body . <EOS>