[Math] Pronunciation of the symbol $\varnothing$ of the empty set

Question

The symbol $\varnothing$ for the empty set was introduced by Bourbaki, inspired by the Norwegian alphabet $\varnothing.$ It has no relation with the Greek letter $\phi.$

From my schooldays, when the concept of the empty set was introduced, I found people pronouncing this symbol of the empty set as "Phi".

My questions are:

If the symbol has no connection with the Greek letter "Phi", then is it legitimate to call it "Phi"?

If not, what should we call the symbol $\varnothing$?

How is the Norwegian letter $\varnothing$ pronounced?

Answer 1

I'd read $A=\varnothing$ as $A$ is empty or $A$ is the empty set.