Quote from NOTmm:
Everytime I see this 0 with a line across it, I stop and wonder what the hell it is.
Is it a 0? If it is a 0, why the line across it?
is it a o? If it is an o, why the line across it?
The line is totally stupid. Who thought of it at IB?
Not by a trader, but by a market maker.
It is a standard representation of zero:
http://en.wikipedia.org/wiki/Slashed_zero