What does m% mean?
Like in this datasheet from TI at the gain error graphs: http://www.ti.com/lit/ds/symlink/ina149-ep.pdf?&ts=1589388038122
Is it supposed to mean per-cent-mille (10^-5) or per-mille (10^-3) or ppm (10^-6)?
Update:
Here is an other datasheet with the same unit: http://www.ti.com/lit/ds/symlink/ina226.pdf?&ts=1589357516155
Here the gain error is given without a unit in the table section (unlike in the first one where it is %FSR), but the values still don't match up with the graphs.
Best Answer
Assuming you're talking about figure 33, looks like they're plotting 1000x the error in %. So milli-percent.
Maximum gain error is 0.047% so that would be 47, which fits with the graph.