Just guessing here, but wouldn't that be the 'Hazard Lights'?
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you can have a question marked followed by an exclamation point.
Circumcenter, this is the center-point of a circle circumscribed around the triangle. If the triangle is obtuse, then this point is outside the triangle and if the triangle is a right triangle, then the point is the midpoint of the hypotenuse.
You can do this when you are shouting your question.
It is the triangle's point of equilibrium or its point of balance.
The general warning lab safety symbol consists of a black exclamation point in a yellow triangle. As you'd expect, it is a general warning to laboratory staff that a hazard exists.