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If you need to defend yourself, start by training. Train every day.

Two simple self defense tools you can use are yawara sticks and tactical pens.

These are inconspicuous items you can carry in a purse or pocket and you can seriously injure someone or even kill them with these tools.

However keep in mind they're also possibly considered concealed weapons. Carrying a concealed weapon is a felony. Check your state laws, sometimes there is a distinction between a blunt and pointed or sharp weapon.