Here is a summary from Wikipedia, Emil Pathric William Christensen (born 14 June 1984 in Stockholm), alias HeatoN, is a Swedish professional Counter-Strike player, currently playing as captain of the gaming team Ninjas in Pyjamas (NiP). He is widely regarded as one the best Counter-Strike players in the world and is well known for his mastery of the "spray technique", which involves controlling the recoil of the gun by precise mouse movements rather than allowing the recoil to settle.

The name HeatoN comes from a brand of equipment he used when he played ice hockey.
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