Katra means caravanserai or roadside inn in Arabic and Persian and may refer to:
Vulcans are a fictional extraterrestrial humanoid species in the Star Trek franchise who originate from the planet Vulcan. In the various Star Trek television series and movies, they are noted for their attempt to live by reason and logic with no interference from emotion. They were the first extraterrestrial species in the Star Trek universe to observe first contact protocol with humans.
Vulcans are depicted as similar in appearance to humans. The main physical differences are their eyebrows and ears: the former are arched and upswept, while the latter feature pinnae that taper to a point at the top. The ears have been the subject of jokes on multiple occasions. Vulcans have been portrayed as various races. Most caucasoid-like Vulcans (most of those shown throughout the series' runs) typically appear with a subtle greenish hue to their skin, due to Vulcans' copper-based blood, which is green in color. Other features described include an inner eyelid, or nictitating membrane, which protects their vision from bright lights, an adaptation for their bright, hot home world. In addition, their hearts are located on the right side of the torso, between the ribs and pelvis; as Dr. McCoy once says about Spock: "He is lucky that his heart is where his liver should be, or he'd be dead!" (ST:TOS, "A Private Little War")
Katra is a village in Kaniavos eldership, Varėna district municipality, Alytus County, southeastern Lithuania. According to the 2001 census, the village had a population of 35 people. At the 2011 census, the population was 19.