The Honor blade is a weapon carried by Romulans.

In 2374, Spock believed that arguments in the Senate were heated enough for them to draw honor blades. (ST short story: "Blood Sacrifice")

Ruanek would use his honor blade to cut his palm in honor of the dead Emperor as he lay in state in the Hall of State. (ST short story: "Blood Sacrifice")

The Romulan vessel IRW Honor Blade, commanded by Charvanek, was named in honor of the ancient weapon. (TNG novel: Vulcan's Heart)