In English, Arbor Day is typically called "Arbor Day." It's a holiday that is celebrated on different days in different places around the world, but it is always a day when people come together to plant trees and celebrate the importance of trees in our lives. The holiday originated in the United States in the 19th century, and it has since spread to many other countries. In some places, it is also called "Tree Planting Day" or "National Tree Planting Day." Some people might also refer to it as "Tree Day" or "Planting Day."