A "Valdris" blade was used in Colorado Springs, Colorado, in two 7-Eleven armed-robberies in 2009. A smaller version of this "belly-spear" (the literal Klingon translation) is used in the children's game of "qa'vak"...which incorporates spinning hoops, and hones assorted skills needed for hunting. Once a male Klingon reaches the Age of Ascension, he is presented with an adult version of the chon'naq by his father - on the occasion of their first hunt together as men. A d'k tahg is a Klingon dagger. The knife has three blades: a main blade with a cutout in the center, and two smaller blades on either side. In some models, these side blades are spring-loaded and can pop out into position and close up for storage. In other models, the blades are fixed. It also features a pommel studded with blunt spikes. The d'k tahg first appeared in "", and appeared occasionally throughout the following films and television series. The knife was designed by Gil Hibben. Although the d'k tahg appeared in "Star Trek III," it was not referred to by its name until "Star Trek: The Next Generation." This polearm is similar to a halberd. Directly descended from the weapon which inspired the Klingon "tIq'ghob" emblem, this dagger (literal translation: "blood-knife") is longer and heavier than the d’k tahg (which was derived from it). Unlike the d’k tahg, which was conceived as a general-purpose combat-knife intended for mass production, the iw'taj is a dedicated dueling weapon. The two side-blades, one pointing up and one pointing down, serve particular functions. The upward-pointing blade is designed to catch an opponent's weapon and, with a twisting motion, disarm him. The downward-pointing blade is designed to inflict shallow cuts in passing, sapping the enemy's strength; said design allows the weapon to advance smoothly, without this blade getting in the way. Duelists often hook their index and middle fingers over the crossbar; doing this allows the weapon to achieve impressive agility, despite weakening the grip...although it may also be used with a reverse grip. The iw'taj is often carried by traditionalists, and by discerning martial artists. Usually, a warrior who carries both a mek’leth and an iw'taj is from a Qvav’mar background...and/or is a personal combatant of high caliber.