Ah-Kel and Ro-Kel, a set of twinned Miradorn males
The Miradorn are a humanoid species, which have distinctive foreheads divided into two hemispheres (which seem to be bones). The species is derived of twins that together form two halves of one being, forming almost a symbiotic relationship. If one twin dies, the other twin will anguish in the loss of "self". They are typically known for being a quarrelsome people.
In 2369, the Miradorn twins Ah-Kel and Ro-Kel raided a Vanoben transport with their Miradorn raider just two light-years from Deep Space 9. Shortly thereafter, they appeared at Quark's Place attempting to sell the Ferengi the stolen item; a valuable, ornate metal sphere. In a botched robbery attempt mastermined by Quark, a Rakhari fugitive, named Croden, killed Ro-Kel. In retaliation, Ah-Kel vowed to avenge his brother's death, his only purpose now left in life, but died trying. (DS9: "Vortex")
In 2373, prior to the outbreak of the Dominion War, the Miradorn signed a non-aggression pact with the Dominion. (DS9: "Call to Arms")