"Tort law" refers to the law that governs civil wrongs that do not arise out of a contract.
There are a ton of torts.
Security professionals would probably be most concerned with the intentional torts assault, battery, and false imprisonment.
If you are working in a business, you would probably also be concerned with duty of care you are required to take to ensure that the property is safe for customers.
Wikipedia has a whole bunch of reasonably accurate information on torts. I wouldn't use it as a substitute for legal advice, though.