average plus or minus...

What is the best way to report data?
I've seen publications where the authors report average +/- standard deviation or standard error. In any case, does the scatter unit is "dimensionless" or does it have the same units as the average?
Thanks for your help!

Confused average jane
Yes, the standard deviation has the same unit as the average. IT's why the formula shows a square root sign, as variance can be in silly units like kg^2