Classical antiquity

Seven deadly sins

Seven Classical planets ("7 Luminaries")

Seven Metals of antiquity

Seven Heavens

Seven days in the week

Seven colors in the rainbow

Seven Seas

Seven Continents

Seven against Thebes

Seven Kings of Rome

Seven hills of Istanbul

Seven hills of Rome

Seven hills of Sheffield

Seven Liberal Arts

Seven Sages of the Bamboo Grove in China

Seven Sages of Greece

Saptarishi – Seven Sages concept in Ancient India

Seven Wise Masters, a cycle of medieval stories

Seven Wonders of the ancient world

7 was considered a God number in ancient Egypt. The Pharaoh usually ordered things in groups of multiples of 7. For a time, 7 was not even used in writings for the people of Egypt.[2]

7 pure notes in the diatonic scale