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[Alexandr Korol]

1. 7 levels of heaven:
In various religious and mythological systems, there is the idea of seven tiers or levels of heaven, reflecting different stages of spiritual enlightenment.

2. 7 notes in music:
The standard musical scale consists of seven main notes: do, re, mi, fa, sol, la, si.

3. 7 wonders of the modern world:
Replacing the famous seven ancient wonders of the world, seven new wonders of the modern world were chosen, including the Taj Mahal and the Great Wall of China.

4. 7 primary colors:
Although the concept of three primary colors is more common, the seven colors of the rainbow spectrum (red, orange, yellow, green, light blue, blue, violet) became well known thanks to Newton.

5. The “Potter” books:
The famous Harry Potter book series consists of 7 parts, each describing one year of schooling at the magic school.

6. 7 deadly sins:
In Christian teaching, seven deadly sins are highlighted, such as wrath, envy, and sloth.

7. Blood groups:
In biology, there are four main blood groups, but considering the Rh factor, 7 unique combinations are distinguished.