Pronunciation of the symbol $\varnothing$ of the empty set 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?

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