A weapon for a fencing discipline, usable for sports or games, suitable to be connected to a detection apparatus provided with at least a first and a second apparatus terminals, the weapon comprising a percussion element, having a percussion portion suitable to deliver a hit on a target, and an electrical device, incorporated in the weapon, wherein the electrical device comprises: - a reference terminal (Tr), suitable to be connected to the first apparatus terminal to receive a reference electrical potential (Vr); - a measuring terminal (Tm), suitable to be connected to the second apparatus terminal to supply an electrical measuring potential (Vm); - a first contact terminal and a second contact terminal, which are arranged so as to come simultaneously into contact with the target when the percussion portion delivers a hit on the target; wherein the electrical device is configured to take a signalling condition when it is connected to the detection apparatus and a hit has been delivered by the percussion portion on the target, in which signalling condition: - the reference terminal (Tr) is maintained at the electrical reference potential (Vr) and is further electrically connected to the first contact terminal; - the first and the second contact terminals are suitable to be electrically connected by means of a target portion comprised there between so as to apply a detection voltage (ΔV) to said target portion depending on the electrical reference potential (Vr); - either the first or the second contact terminal is electrically connected to the measuring terminal (Tm) so that the electrical measuring potential (Vm) takes a signalling value, depending on said electrical reference potential (Vr) and detection voltage (ΔV), and wherein the electrical device is further configured to take a resting position, when it is connected to the detection apparatus and when it is not in the signalling condition, wherein the first and the second contact terminals are not electrically connected to each other through the target and wherein said electrical measuring potential (Vm) takes a resting value distinguishable from the signalling value; said resting value of the electrical measuring potential (Vm) being representative of the resting condition of the electrical device and said signalling value of the electrical measuring potential (Vm) being representative of the signalling condition, indicative of at least one electrical property of the target, and indicative of the fact that the target is made of insulating material, or of resistive material or of conductive material. - a reference terminal (Tr), suitable to be connected to the first apparatus terminal to receive a reference electrical potential (Vr); - a measuring terminal (Tm), suitable to be connected to the second apparatus terminal to supply an electrical measuring potential (Vm); - a first contact terminal and a second contact terminal, which are arranged so as to come simultaneously into contact with the target when the percussion portion delivers a hit on the target; - the reference terminal (Tr) is maintained at the electrical reference potential (Vr) and is further electrically connected to the first contact terminal; - the first and the second contact terminals are suitable to be electrically connected by means of a target portion comprised there between so as to apply a detection voltage (ΔV) to said target portion depending on the electrical reference potential (Vr); - either the first or the second contact terminal is electrically connected to the measuring terminal (Tm) so that the electrical measuring potential (Vm) takes a signalling value, depending on said electrical reference potential (Vr) and detection voltage (ΔV),