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no fencing weapon has 4 sided blades.
The largest and heaviest Fencing weapon is the Epee
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
Kill or capture the enemy with minimal collateral damage. Also destroy weapon and ammo storage facilities. And finally destroy command and control facilities.
I believe it was a fencing rapier.
The best fencing weapon would usually be the sword.
The weapon used for training in the fencing duel era was called the foil (fleur). It is still used as one of the 3 weapons for fencing today, although it has never historically been a real weapon used for combat. There isn't a training sword in fencing. Originally the foil (see above) before the sport fencing - like we know it now - exsisted. Now you choose a weapon (like the foil) and train with that. So in fencing there is no training sword.
This nuclear weapon is called an atomic bomb or a nuclear bomb
An atomic weapon is an alternative name for a nuclear weapon, a weapon which derives its energy from the nuclear reactions of either fusion or fission.
Nuclear weapon detonations
If by "bomb" you mean a conventional explosive weapon, then the nuclear weapon is more powerful.
That would be Sabre fencing.