Two is most commonly a determiner used with plural countable nouns, as in two days or I'll take these two. Two is a noun when … See more

An integer is determined to be even if it is divisible by two. For integers written in a numeral system based on an even number such as decimal, divisibility by two is easily tested by merely looking at the last digit. If it is even, the… See more

Powers of two are essential in computer science, and important in the constructability of regular polygons using basic tools (e.g., through the use of Fermat or Pierpont primes). is the only number such that the su… See more

In a Euclidean space of any dimension greater than zero, two distinct points in a plane are always sufficient to define a unique line.
Regarding regular polygons in two dimensions: … See more

The digit used in the modern Western world to represent the number 2 traces its roots back to the Indic Brahmic script, where "2" was written as two horizontal lines. The modern Chinese and Japanese languages (and Korean … See more