Is there a way I can redefine the `||` operator such that `a||b` will be `1/(1/a + 1/b)`?

Is it possible to define it infix as above and prefix such that `||[a,b,c]` is `1/(1/a+1/b+1/c)`?

I'm working with circuit impedances and it's a much more natural way of describing the circuit to use `+` for series and something simple like `||` for parallel.