Deterrent (noun)

1. A thing that discourages or is intended to discourage someone from doing something.
2. A nuclear weapon or other armament or military device that is intended to prevent an enemy attack.

Origin:

Mid 17th century: from latin deterrent- "deterring", from the verb deterrere (see deter).

Examples:

1. The threat of imprisonment is a deterrent to crime.
2. Higher taxes can be a deterrent to investment.
3. The city installed cameras as a deterrent to vandalism.
4. The use of nuclear weapons as a deterrent during the Cold War.
5. The country's missile defense system serves as a deterrent to potential aggressors.