4 - Wikipedia In internet slang, "4" can replace the word "for" (as "four" and "for" are pronounced similarly) For example, messaging "4 u" instead of "for you" when talking to someone
4 (number) - New World Encyclopedia Four is the second square number (a "square number" is an integer that can be written as the square of some other integer) and the second centered triangular number
four - Wiktionary, the free dictionary four (countable and uncountable, plural fours) (countable) The digit or figure 4; an occurrence thereof (countable) Anything measuring four units, as length
Number 4 - Curious Math Facts and Interesting Properties Explore the hidden properties of 4, an even semiprime number composed of a single prime number multiplied by itself Includes Prime Factorization, Divisors, Bases and Fun Facts for students, number lovers and curious minds
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