“group / association” in Japanese is 団, read dan, ton (だん, とん). It is a Grade 5 Kyōiku kanji, taught in year 5 of Japanese elementary school, and appears in words such as 団体 (organization).
What does 団 mean?
ふとんの布団をたたむ。
Same sound, different character — the classic trap. Compare them side by side: