A Kolba's tooth was a commando knife used by the Bajoran Resistance.
Kira Nerys carried a Kolba's tooth knife throughout all her time in the resistance during the Occupation of Bajor. While Kira used it only once to kill an individual, it was convenient for menial tasks like cutting a fishing line or to open a food pack. Kira still sometimes carried the knife during her assignment to Deep Space 9. (DS9 - Rebels novel: The Liberated)