The Dirhja was a melee blade from the Romulan civilization. These beautifully designed weapons often possessed a jeweled hilt some of which were quite valuable. They were unique as they had three perfectly equilateral edges rather than two and was incredibly sharp. The advantage they had over two edged swords was that when they were wielded skillfully, a dirhja entered a body painlessly and with little loss of blood. They were noted as being a subtle weapon when compared to an axe and used the opponent's own weaknesses against them though ultimately it always left behind a scar.