To be honest I hadn’t noticed the different name and was very confused. That’s why I came to the comments, so thanks.

Regarding the sprinklers all going off. I assume you’re familiar with the type that have the glass bulb type that has water in the system waiting to drop. I enquired about this years ago at work here in Australia where we use those types of systems ( I was an electrical fire alarm tech/ installer for a long time ) There are “dry” types that don’t have the glass bulbs and no water in them. When there’s a fire the water gets pumped through the system. I don’t actually know what sets them off to be honest.