When dealing with currents (as in electrical engineering and electronics) direction of the motion of electrons almost never matters, we just speak about current flowing following the original convention.
When it matters (like in describing the redox chemistry, or mechanisms behind behavior or semiconductor devices) we typically don't speak about current per se, but abut behavior of electrons, so making a mistake is rather unlikely.
But no, I am not aware of any special symbols used to distinguish, unless we treat I for current and e- for electrons as "special".