Mevak
The mevak was a traditional Klingon dagger used in such rituals as the Mauk-to'Vor. ()

Appendices

Background information 
This blade was also seen in , only in that episode it was called a kut'luch, which was itself introduced in  and had a very different appearance.

The mevak was designed by illustrator John Eaves. Because the screenplay of  didn't specify any particular design type, Eaves was allowed a free hand in creating the blade, and he ultimately designed it with two separated blades - one for extinguishing the physical life, one for freeing the soul to allow it to travel to Sto-vo-kor. (Deep Space Nine Sketchbook: John Eaves, DS9 Season 4 DVD special features)

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Klingonese
Hand-held weapons