Final answer:
The Japanese National Quidditch team used brooms called "irodate" brooms. These brooms have a unique name in Japanese and are not specifically named in English as "arrow sign."
Step-by-step explanation:
The brooms used by the Japanese National Quidditch team in the Harry Potter series are called “irodate" brooms. These brooms are not specifically named in English as “arrow sign,” but instead have their own unique name in Japanese. The term “irodate” translates to “arrow sign” in English and refers to the shape of the broomstick.
This is an interesting cultural aspect, as the broomsticks used in the Quidditch matches portrayed in the books and movies vary from country to country, reflecting the specific culture of each national team.
For example, the Bulgarian Quidditch team uses brooms called “Vajda." It's important to note that these brooms are purely fictional and do not exist in the real world.