A small Klingon sculpture of two warriors locked in combat, kept by Worf in his quarters, showing Kahless the Unforgettable fighting his brother Morath for bringing shame on their family.
The statue stands in Worf's quarters aboard the Enterprise-D for most of The Next Generation, and goes with him afterwards. It depicts a story every Klingon child is told: Kahless fought his brother Morath for twelve days and twelve nights because Morath had broken his word and dishonoured their family.
Its meaning is explained in New Ground (2368). Alexander, newly come to live aboard the ship, has been caught stealing and lying about it, and Worf shows his son the sculpture and tells him the legend as a lesson in what a Klingon's word is worth.
The lesson is only partly learned, and Worf comes close to sending the boy away to school before deciding to raise him himself. The sculpture remains a recurring piece of set dressing wherever Worf lives.