- (chemistry) lutetium.
- A diminutive of the female given name Lucy and related names.
- 1950 C. S. Lewis, The Lion, the Witch, and the Wardrobe, Fontana Lions (1980), ↑ISBN, page 27:
- "Why?" said Lucy in amazement, "haven't you all been wondering where I was?" "So you've been hiding, have you?" Peter said. "Poor old Lu, hiding and nobody noticed!
- An ancient vassal state of China that existed approximately between 1042–249 BC.