three-of-a-kind of April, May, July, or December suit
In hanafuda, a dealt hand containing three cards from the same month, specifically from the April, May, July, or December suits. This is a special scoring hand.
See also: 手役
If you get a tatesanbon in your hand, you can score high points.
立三本は、四月、五月、七月、十二月の札でそろえる役です。
Tatesanbon is a hand made by collecting cards from the April, May, July, or December suits.