Use this tag when a character's seemingly larger than normal hand size. More specifically, the hands tend to be as big as their head, or slightly bigger. This does not take into account perspective or foreshortening.
The opposite is small hands.
Having hands larger than normal is generally considered to be a masculine trait that some find attractive, so much so it has become a trope in the yaoi genre, often called "Yaoi hands".
However, having larger hands can be a character design choice as well. But since it's not very common, the hand sizes for such characters tend to be more variable, especially in fan art.
Not to be confused with oversized forearms.