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. From bing.com
FOUR DEFINITION AND MEANING | COLLINS ENGLISH DICTIONARY
Judith is married with four children. In cricket, if a player hits a four, they score four runs by hitting the ball along the ground so that it crosses the boundary at the edge of the playing area. Taylor hit 13 fours and batted for 140 minutes. A four is a narrow racing boat that is rowed by a … From bing.com
Something having four parts, units, or members, such as a musical quartet or a four-cylinder engine. All four limbs of an animal or person: a baby crawling on all fours. [Middle English, from Old English fēower; see k w etwer- in Indo-European roots.] American Heritage® Dictionary of the English Language, Fifth Edition. From bing.com
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. Sculpted date "1481" in the Convent church of Maria Steinach in Algund, South Tirol, Italy. The upward loop signifies the number 4. From bing.com
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