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 includes 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 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 nonaggression pact with the Dominion. (DS9: "Call to Arms")