What does a five -point seat belt mean (divided single hook, double hook, two)

What does a five -point seat belt mean?

That is to say, there are five protection: there are five protection:

The protection of two shoulders, one waist, and two legs.

There are four types of hooks:

Single small hooks, single big hooks, double hooks, double big hooks.

There are three types of rope::

2 meters, 3 meters, and 5 meters.