Hello my grocery store was recently rebuilt I’m surprised they added a bell outside surprise they didn’t go with horn or strobe but inside they have an entire Edwards system
That bell could be part of the sprinkler system. It is typical that sprinkler system bells are mechanically operated by a water motor in the sprinkler riser. That way it rings as long as water is flowing.
It is probably more common to find a bell than a horn/strobe in a sprinkler system but I don’t think its terribly rare to see a horn/strobe in one though.