• 団体だんたい — organization, group
• 集団しゅうだん — group, mass
• 軍団ぐんだん — army corps
• 楽団がくだん — orchestra
• 劇団げきだん — theatrical troupe
• 団結だんけつ — unity, solidarity

The character 団 originally includes the radical 囗 (enclosure) and a phonetic element 專. The shape suggests something rounded or enclosed, representing a cluster or group. The 教育漢字 (kyōiku kanji) version simplifies the form.

この団体だんたいは 環境かんきょうを 守まもるために 活動かつどうしています。
This organization is working to protect the environment.

彼かれは 劇団げきだんに 所属しょぞくしている。
He belongs to a theater troupe.

This kanji uses the on-yomi ダン. It frequently appears in compound nouns to refer to various types of groups, associations, or collective efforts.