Here are some notable things that come in sevens:

• The Seven Wonders of the Ancient World: Hanging Gardens of Babylon, Pyramids of Giza, Colossus of Rhodes, Lighthouse of Alexandria, Mausoleum at Halicarnassus, Temple of Artemis at Ephesus, Statue of Zeus at Olympia.

• The Seven Deadly Sins: Pride, Avarice, Lust, Anger, Gluttony, Envy, Sloth.

• The Seven Virtues: Faith, Hope, Charity (theological virtues) and Temperance, Prudence, Fortitude, Justice (cardinal virtues).

• The Seven Liberal Arts: Grammar, Logic, Rhetoric, Arithmetic, Music, Geometry, Astronomy.

• The Seven continents of the world.

• The Seven colors of the rainbow.

• The Seven days of the week.

• The Seven seas - a traditional grouping of major seas.

• The Seven Archangels often named in religious traditions.

• The Seven Summits - highest mountains on each continent.

• The Seven Heavens - a concept in various religions.

• The Seven Sisters - names used for various groups of seven in culture and nature.

• Other mystical, cultural and mathematical significances attached to the number 7, such as the seven classical planets, and the seven fundamental types of catastrophes in mathematics.

These are just some well-known examples of groupings of seven that occur in culture, religion, nature, and knowledge.