Life & Spirit・Popular Kanji “Reisei” – Japanese Kanji for Calmness. 投稿者: japanese-kanjisymbols 投稿日: 2011/05/252012/01/18 I wrote “Reisei”. It’s Japanese kanji symbols for Calmness or Coolness. “Rei” means Cool, Cold or Chill “Sei” means Quiet Exactly, “Reisei” means that being to calm down without becoming emotional. What is your favorite word? Please let me know your favorite word.