NRS 655.020: “Key” defined.

“Key” means a mechanical device used for operating a lock and includes, but is not limited to:

1. A change key or a key designed to operate a specific lock.

2. A manipulation key or a key designed so that when variously positioned in the keyways of locks will operate the locks.

3. A master key or a key designed to operate a series of locks which are individually operated by change keys.

4. A tryout key or a key that will operate a series of locks in a larger series of locks.