$\pi i$ or $i \pi$?

Question

Is the usage of either $\pi i$ or $i \pi$ technically correct compared to the other? I have seen both used frequently by many sources.

Edit: I understand the two are equal. I am asking whether there is any convention which makes it preferable to write either $\pi i$ or $i \pi$, in the same vein as why we write $2x$ and not $x2$.

Answer 1

They are equal since multiplication over the complex number field is commutative.

$$\pi i = i \pi$$

Edit:

I am not aware of any convention that suggests one is preferable to the others. Here is another related post.

Answer 2

As for me I prefer to write $i \cdot \pi$.

Answer 3

I suppose that if you're writing it as a polynomial in $\pi$, then $i \cdot \pi$ makes sense, as we put coefficients on the left as a convention. But otherwise, I do not see any practical advantages of one over the other.