What does ENT mean in NASA?

Ent

Ents are a species of beings in J. R. R. Tolkien's fantasy world Middle-earth who closely resemble trees; their leader is Treebeard of Fangorn forest. Their name is derived from an Old English word for "giant". The Ents appear in The Lord of the Rings as ancient shepherds of the forest and allies of the free peoples of Middle-earth during the War of the Ring. The Ent who figures most prominently in the book is Treebeard, who is called the oldest creature in Middle-earth (a description also given to Tom Bombadil). At the time of the War of the Ring, there are no young Ents (Entings) because the Entwives (female Ents) were lost. Akin to Ents are Huorns, whom Treebeard describes as a transitional form of trees which become animated or, conversely, as Ents who grow more "treelike" over time.Inspired by Tolkien and similar traditions, animated or anthropomorphic tree creatures appear in a variety of media and works of fantasy.

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