$TREE can refer to two distinct things: a digital currency project with an environmental focus or an art object representing a tree with coins. In the context of digital currencies, "Tree currency" or "Tree project" refers to a cryptocurrency project that generally focuses on sustainability, environment, or tree-related projects. On the other hand, a "money tree" is an artistic object, typically made of ceramic or metal, that represents a tree with coins hanging from its branches, often associated with Han culture in China and symbolizing prosperity and good fortune.