If $E$ and $F$ are field, what is $E\vee F$? If $E$ and $F$ are field, what is $E\vee F$ ? Let take for exemple $E=\mathbb Q(a)$ and $\mathbb Q(b)$. Do we have $$E\vee F=\mathbb Q(a,b) \ \ ?$$ 

I expect $\lor$ is to be interpreted as join, which is to say $E \lor F$ is the least (with least being intepreted in terms of $\subseteq$) field containing both $E$ and $F$. I am willing to be corrected though.
