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  1

  1 (one;  /ˈwʌn/ or UK /ˈwɒn/) is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of "unit length" is a line segment of length 1. One, sometimes referred to as unity, is the...
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  Pi

  The number π is a mathematical constant that is the ratio of a circle's circumference to its diameter. The constant, sometimes written pi, is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century. π is an irrational number, which means that it...
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  13

  13 (thirteen  /θɜrˈtiːn/) is natural number after 12 and before 14. It is the smallest number with eight letters in its name spelled out in English. It is also the first of the teens – the numbers 13 through 19 – the ages of teenagers. In speech, the numbers 13 and 30 are often confused. When...
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  2

  2 (Two; /ˈtuː/) is a number, numeral, and glyph. It is the natural number following 1 and preceding 3. Two has many properties in mathematics. An integer is called even if it is divisible by 2. For integers written in a numeral system based on an even number, such as decimal and hexadecimal,...
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  9

  9 (nine /ˈnaɪn/) is the natural number following 8 and preceding 10. The ordinal adjective is ninth. According to Georges Ifrah, the origin of the 9 integers can be attributed to the ancient Indian civilization, and was adopted by subsequent civilizations in conjunction with the 0. In the beginning...
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  42

  42 (forty-two) is the natural number immediately following 41 and directly preceding 43. The number has received considerable attention in popular culture as a result of its central appearance in The Hitchhiker's Guide to the Galaxy as the "Answer to the Ultimate Question of Life, the Universe, and...
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  10

  10 (ten /ˈtɛn/) is an even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, by far the most common system of denoting numbers in both spoken and written language. The reason for the choice of ten is assumed to be that humans have ten fingers (digits). Ten...
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  12

  12 (twelve /ˈtwɛlv/) is the natural number following 11 and preceding 13. The word "twelve" is the largest number with a single-morpheme name in English. Etymology suggests that "twelve" (similar to "eleven") arises from the Germanic compound twalif "two-leftover", so a literal translation would...
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  11

  11 (eleven /ɨˈlɛvɨn/ or /iˈlɛvɛn/) is the natural number following 10 and preceding 12. Eleven is the first number which cannot be counted with a human's ten fingers. In English, it is the smallest positive integer requiring three syllables and the largest prime number with a single-morpheme name....
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  3

  3 (three;  /ˈθriː/) is a number, numeral, and glyph. It is the natural number following 2 and preceding 4. It is frequently noted by historians of numbers that early counting systems often relied on the three-patterned concept of "One- Two- Many" to describe counting limits. In other words, in...