Series of seven

• The Seven Dwarfs, e.g.
• Jazzy septet?
• Boss welcomes training group
• The "Harry Potter" books, e.g.
• Quintet plus two
• Disney's dwarfs, e.g.
• Any group of seven
• Snow White's Dwarfs, e.g.

Wiktionary Word definitions in Wiktionary
n. a group of seven things