Suitable icon/icons to indicate a non-emergency system event

I'm looking for a way to denote a non emergency in a system, something like the opposite of an exclamation mark, to indicate that a business event that was thought to be an emergency is actually not an emergency.

I have considered an exclamation mark with a cross through it, but I don't think this is effective because it is not immediately recognisable or sufficiently different.

I've also considered a tick, but it doesn't seem totally suitable either.