Definition: body-enclosing garment invented on Arrakis. Its fabric is a microsandwich performing functions of heat dissipation and filter for bodily wastes.
Commentary: Remarkably ingenious devices, invented here by the native population. Though local manufacturers and even CHOAM have attempted to replicate the stillsuit, it is well known that the most efficient stillsuits are crafted by the Fremen.

Definition: a device that uses a static discharge to either repel or attract sand. Used as a digging tool in loose sand surfaces or to gather particles together on the surface.
Commentary: Another invention of the Fremen, but one that I find has broader applications. For example, the static discharge attracts all particles, including airborne, so can be used to clear poisionous gas from the air. It also has a damping effect on fire, gathering it together so that it disperses in an instant. Useful indeed.

Definition: the sacred knife of the Fremen on Arrakis. It is manufactured in two forms from teeth taken from dead sandworms. The two forms are "fixed" and "unfixed." An unfixed knife requires proximity to a human body's electrical field to prevent disintegration. Fixed knives are treated for storage. All are about 20 centimeters long.
Commentary: The information from the archives seems surprisingly complete considering that for decades the Harkonnen have had a bounty offering a million solaris for an intact crysknife. Which makes me wonder who has been editing the Imperial Archives?

Definition: short stake with spring-driven clapper at one end. The purpose: to be driven into the sand and set "thumping" to summon shai-hulud.
Commentary: Once again, the native population has created an obvious, effective solution to one of the problems of the desert – the sandworm. Once it was understood how to draw sandworms away from spice harvesting sites using thumpers, spice yields increased by 15%. Of course, the sandworm always comes so thumpers have a limited efficiency in the long run.

Definition: small, scalable enclosure of micro-sandwich fabric designed to reclaim as potable water the ambient moisture discharged within it by the breath of its occupants.
Commentary: An expansion of the stillsuit technology, these portable shelters are mostly useful when traversing on foot. If a ‘thopter goes down in the desert, I can see how this could be a useful way to get home. The question remains though, without vehicles, how are the Fremen able to penetrate so deeply into the south?

Definition: a receptacle that can receive a corpse and then drains and filters the fluids for water. The waste is sluiced off into a separate compartment.
Commentary: discovering these was an unexpected boon of the Sardaukar pogrom. Deep within the abandoned sietches we found ceremonial deathstills and great, empty chambers where it seems water once flowed. The practicaility of the Fremen astounds me still – and CHOAM have already begun building imitation deathstills for the slavers and miners who might find themselves with an excess of bodies, and a lack of water.

Definition: map of the Arrakis surface laid out with reference to the most reliable paracompass routes between places of refuge. (See Paracompass.)
Commentary: Detailed maps of the Deep Desert are impossible to create due to the guild prohibition on satellites and the constant storms which alter the landscape. A survey probe can be used to map local terrain, and create a sinkchart for distribution. Be wary though, sinkcharts are quickly out of date.

Definition: any compass that determines direction by local magnetic anomaly; used where relevant charts are available and where a planet's total magnetic field is unstable or subject to masking by severe magnetic storms.
Commentary: On Arrakis, due to the magnetic interference of the storms and the moons, the paracompass is the sole means of guidance. But when in Hagga Basin South (south of the pole) heading para-north (also south from the pole) it can become confusing. My advice: don’t overthink it.