Honor blade

"They teach classical swordplay at Fleet Academy mostly to build aggression. You're not actually expected to kill with the sword in the field but there's this old Rihan saying: ‘Aihnir ih'sanhaein khhya emael; rhadai ih'sanhaein khhya dvaer.’  Loose translation, ‘There are no dangerous weapons, only dangerous people.’"

- Alina t'Aimne,

An honor blade (Rihan: sienov omienai or sienov nnea omienai, lit. "sword of honor") was a traditional Romulan sword resembling a saber. The curved blades typically featured a basket hilt. They were often heirlooms of Romulan noble families and kept ritually sharp. 

Admiral Valdore i'Kaleh tr'Ihaimehn carried an honor blade with him. He used his honor blade to kill his technologist Nijil after discovering his connection to the Ejhoi Ormiin dissident group. Valdore also used it against Admiral Dagarth when she used a mutagenic device against Haakona Prime without his authorization.

After the ending of the Earth-Romulan War, Commander Terix Val'Danadex Trel tr'Llweii used his ritually sharpened blade to behead First Consul T'Leikha after she assassinated Admiral Valdore. 

The Romulan Naval Academy taught classical swordwork with the honor blade primarily as a means to build aggression.

In 2410 a group of smugglers led by Jethro Wisniewski looted an honor blade from the ruins of Stronghold Ortikant on the destroyed planet Romulus. The weapon had an ornate basket hilt with a pearl set into the pommel.

Subadmiral Morgaiah t'Thavrau was trained in the use of the honor blade, whereas her executive officer Commander Sarsachen tr'Sauringar favored the rapier.