Umur was one of the Cardassian numbering systems. The Umur numbering base originated with the warrior caste in Cardassian society, and was later used by the Cardassian Union military. In 2369, the Cardassians expressed interest in sending what they called an unarmed research vessel through the Bajoran wormhole into the Gamma Quadrant. When Chief of Operations Miles O'Brien of Deep Space 9 sent specifications for the impulse energy buffers to the Cardassians in order to prepare their ships for installation of the buffers, someone translated it into umur rather than the mercantile base damur.