Reman blade weapons were the hand-held blades carried by the Remans during the 24th century. (Star Trek Nemesis)
Jackal knife[]

Shinzon's jackal knife
This large dagger was carried by Praetor Shinzon. He attempted to use it to kill Captain Jean-Luc Picard aboard the Scimitar in 2379.
Shinzon's Reman Viceroy carried an identical knife while leading a boarding party aboard the USS Enterprise-E, and used it to wound Captain William T. Riker in the arm, also in 2379. (Star Trek Nemesis)
In 2401, Vadic used such a knife to sever her hand, with which she used to communicate with her superior. (PIC: "No Win Scenario")
Double shadow knife[]

Shinzon's double shadow knife
This smaller knife was also carried by Shinzon. Shinzon used it to cut his palm, so as to draw some blood for a DNA analysis. Doctor Beverly Crusher later analyzed the knife under a proton microscope to determine that Shinzon was a clone of Jean-Luc Picard. (Star Trek Nemesis)
Similar knives were used by the Romulan assassins that killed Dahj Asha and Caler in 2399. (PIC: "Remembrance")
In 2401, the Vulcan kingpin Krinn gave two such knives to Worf and Commander Raffi Musiker, whom he intended to force to fight to the death. Musiker stabbed Worf with hers, apparently killing him. (PIC: "Imposters")
Bayonets[]
Reman soldiers affixed curved, bayonet-like blades to the barrels of their disruptor rifles during their attempt to board the USS Enterprise (NCC-1701-E) in 2379. (Star Trek Nemesis)