​WEAPON (O. Eng. wæpen, cf. Du. wapen, Ger. Wappe, also Wappen, a coat of arms, heraldic shield), any instrument of offence or defence, more usually a term confined to offensive or attacking instruments. The general sketch of the history and development of weapons of offence and defence is given under Arms and Armour; particular weapons are treated under such heads as Halberd, Lance, Spear, Sword, Gun, Pistol, Rifle, Ordnance and Machine-guns.