File:Curved knife (Frank Herbert's Dune, 2000, Sci-Fi Channel).jpg

Summmary
A knife with a wooden handle and slightly curved steel blade used by House Atreides in the Sci-Fi Channel miniseries Frank Herbert's Dune (2000).

This style of knife is used by Paul Atreides and Gurney Halleck during their sparring training at Castle Caladan and it is also Gurney's weapon of choice throughout the miniseries. He uses it to dispatch the fleeing Harkonnen-hired assassin at the Arrakeen palace, take out several Harkonnen and sardaukar soldiers and defend himself when the Fremen ambush the group of smugglers Gurney had joined after the attack on the Atreides.

It's unclear whether this is meant to be a slightly curved kindjal or some unrelated type of fighting knife.

Image source: Prop Store London website (used film and TV props) - these props from the miniseries are no longer on offer