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Three

Three (3) is a the natural number following two and preceding four.

Three is the second smallest prime number, the next is five.

3 goes into 9 exactly 3 times, so fractions with 3 in the denominator have a single digit repeating sequences in their decimal expansions. A natural number is divisible by three if and only if its decimal digit sum is divisible by 3.

Many human cultures have given the concept of three-ness symbolic meanings:

Three (三 pinyin san1) is considered a good number in Chinese culture because it sounds like the word "alive" (生 pinyin sheng1), compare to four.

Three is also:

  • the number of musicians in a trio.

Decals and bumper stickers bearing the phrase "In Memory of 3" are references to NASCAR driver Dale Earnhardt.


Other uses for three:

  1. Three's Company[?]
  2. Three of a Kind[?]



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