[b2gills]

I think it matters who your audience is.

If your audience is mostly programmers then just use `*`

If your audience is physicists or mathematicians then `×` or `·` may be a better fit.

When turning a math expression into code, it is often handy if the code looks a lot like the expression. Even better if you can just copy and paste it. It's hard to translate an expression wrong if you aren't translating it at all.