Conventional weapons can be firearms like pistols, revolvers, shotguns etc. They can be the sharp edged kind like daggers, knives and swords.
When there is an intention to wound or kill , any object if sharp or heavy enough, can become a weapon. Detective novels as well as true crime stories show you how creative people can be in their choice of weapon.
Let’s not forget weapons of defense. This can be any object that is handy.