雷電
Japanese for "thunderbolt". The proper pronunciation rhymes with "my den", not "maiden".
And now, to remind you that there are other kinds of nerd on e2:
Any fan of sumo will tell you that Raiden - or, to give him his full title, Ozeki Raiden Tameimon - is popularly regarded as the greatest sumo wrestler of all time.
Tarokichi Seki was born in 1767 in the village of Oishi, Shinano Province (now Nagano Prefecture), to a poor peasant family. From childhood he took an interest in the seasonal travelling sumo exhibitions; as an uncommonly tall, strong young man of seventeen, he caught the eye of a scout from Urakaze-beya (the Urakaze sumo stable). He followed the troupe back to Edo, joined Urakaze-beya, and adopted the fighting name of Raiden.
His first tournament was in November 1790, where he immediately distinguished himself by winning all his bouts and the championship. Over a career lasting 21 years, he won another 24 of 32 championships; his lifetime tournament record of 254 wins to ten(!) losses (plus two draws and nineteen no-contests) remains unapproached. Although the supreme honour of Yokozuna had been instituted by his time, Raiden declined the title in deference to his sponsor, Unshu-Matsudaira - responsibility for its bestowing belonged to Matsudaira's feudal rival.
In his day, Raiden was a popular hero, inspiring awe not only with his fearsome 6'5", 370lb frame, but with his skill, his speed, and his famous intelligence and grace. He embodied what has become the sumotori creed: shin, gi, tai - "heart, technique, physique".
Raiden died on February 11, 1825, aged 59. His body is interred at Akasaka, and he has gravesites at Matsue (seat of the Matsudaira clan) and Oishi containing locks of his hair.
"Raiden" by Masumi Abe
<http://www.sumoweb.com/old/essays/raiden.html>
"The Great Raiden" by Nakamura Chaho
<http://www2.crosstalk.or.jp/nakamura-chaho/raiden.htm>
The Sumo Mailing List, archived at
<http://www.banzuke.com/ArchiveIndex.html>
Also:
The Mistubishi J2M Raiden was a Japanese land-based fighter-interceptor warplane produced in the latter stages of World War II. It was designed for fast climb and heavy offensive capability, making it a valuable asset in homeland defence against America's high-altitude B-29 Superfortress bombers.
"Aircraft of the World" by Joe Baugher et al
<http://www.csd.uwo.ca/~pettypi/elevon/baugher_other/j2m.html>