As an electrical engineer (by way of physics and math), I'll use any other damn letter that makes sense for current that you want, and try to sway my fellows to

As an electrical engineer (by way of physics and math), I'll use any other damn letter that makes sense for current that you want, and try to sway my fellows too. I just haven't seen a good option yet. What have you got? "c"... no good, speed of light for one; and also current needs good a good alteration for DC vs AC, "c" and "C" look too similar when written by someone else's hand (and "C" is crap in equations anyway since it can look too much like a "("). Current is a flow, but "f" is well used. Any good suggestions?