The levels indicate what size of bullet a vest has a chance of stopping. I’m sure your country also has some rubric for this, despite you not knowing about it.

I literally cannot understand why every urinal has a permanent piss puddle under it. It’s like once the 1st bastard misses all subsequent pissers are forced to not step in piss and stay further and further away, only leading to more piss. It’s a feed back piss cycle.