Four seasons in Japan

"Four is the door."

Four is often seen as a cycle.

Traits of 4Edit

  • Composite number
  • Square number
  • Even number

Examples of 4Edit

  • Four bases make DNA and RNA

  • Four chambers of the heart

  • Four blood groups: O, B, A and AB

  • Four main brain waves: alpha, beta, delta, theta

  • Quadrupeds

  • Four hits in baseball: singles, doubles, triples, home runs

  • Four Horsemen of the Apocalypse

  • The Four Gospels

  • The Four Noble Truths in Buddhism

  • The Four Rightly-Guided Caliphs

  • Four elements: earth, air, fire and water

  • Four directions: north, south east and west

  • Four seasons: spring, summer, fall and winter

  • Four suits of playing cards: hearts, clubs, diamonds and spades

  • Four states of matter: solid, liquid, gas and plasma

  • Four parts of structure: points, lines, area and volume

  • Expressions: “Square deal”, “Square meal”, “Fair and square”, “Back to square one”, “Planted squarely on the ground.”

  • Four corners of the world

  • Origami always starts with a square

  • The Tetragrammaton