The term ELM refers to three different things. The first is a tree, which is a type of deciduous tree that is native to Europe, Asia, and North America. It is known for its distinctive leaves and bark. The second is WAHOO, which is a species of fish found in the Atlantic Ocean. It is a popular game fish and is known for its speed and agility. The third is Ulmus, which is a genus of trees in the family Ulmaceae. These trees are found in temperate regions of the Northern Hemisphere and are known for their hardwood and fast-growing nature.