Task: Explanation
Input (English): Teemu Ilmari Selänne (] ), nicknamed "The Finnish Flash" (born July 3, 1970), is a Finnish former professional ice hockey winger. He began his professional career in 1989–90 with Jokerit of the SM-liiga and played 21 seasons in the National Hockey League (NHL) for the Winnipeg Jets, Anaheim Ducks, San Jose Sharks and Colorado Avalanche. Selänne is the highest scoring Finn in NHL history, and one of the highest overall; he retired in 2014 11th all-time with 684 goals and 15th with 1,457 points. He holds numerous team scoring records for both the Winnipeg/Arizona franchise and the Anaheim Ducks. His jersey number 8 was retired by the Ducks in 2015. On January 27, 2017, in a ceremony during the All-Star Weekend in Los Angeles, Selanne was part of the second group of players to be named one of the '100 Greatest NHL Players' in history.. On June 26, 2017, Selanne was elected to the Hockey Hall of Fame as the second Finn after Jari Kurri. Question: What is the nickname of the National Hockey League player born in Helsinki who played 21 NHL seasons? Answer: "The Finnish Flash"
Output (English): Teemu Ilmari Selänne  , nicknamed The Finnish Flash born July 3, 1970, is a Finnish former professional ice hockey winger.