The 5 lever lock is a type of lock

Lock (device)

A lock is a mechanical or electronic fastening device that is released by a physical object or secret information , or combination of more than one of these....

 often required for home insurance

Home insurance

Home insurance, also commonly called hazard insurance or homeowner's insurance , is the type of property insurance that covers private homes...

 and often recommended by the police for home security. There are various grades but the current British Standard (BS3621:2007) is usually required for insurance purposes. The lever mechanism is really only seen in the UK and some parts of Scandinavia, and locks using this form of mechanism are frequently referred to as Chubb locks

Chubb Locks

Chubb Locks is a brand name of the Mul-T-Lock subsidiary of the Assa Abloy Group, which manufactures high security locking systems for residential, secure confinement and commercial applications.-History:...

although there are a great many manufacturers. BS3621:2007 requires a bolt throw of 20 mm rather than the 14 mm of the earlier British Standard.
Most BS3621 locks have anti pick devices built in to reduce the chance of lock picking

The lever

A flat, non ferrous metal, shaped double-acting movable detainer in a lock. Usually pivoted, but sometimes slide. The levers in a lock have to be moved by the key to operate the lock. The belly of the lever is cut away to various depths to provide different combinations. A lever will have pockets and gates through which the bolt stump moves during unlocking.