What is considered a small hand for shimano? The new shimano r7000 offers two options r7025 and r7000 in the brake levers, the first one is for small hands.

What is considered small hands?
You'd probably have to try it and see which is most ergonomic for you; even if you have large hands, the small hands lever may feel better. Older levers came with a rubber piece to stick in the brifter to adjust for smaller hands, but this has limited differences versus a different lever. 

Most females would fit into the small hands group. Younger males up to some age might as well. Adult males of average or larger size would likely not.