Brahmic numerals represented 1, 2, and 3 with as many lines. 4 was simplified by joining its four lines into a cross that looks like the modern plus sign. The Shunga would … See more

Four is the smallest composite number, its proper divisors being 1 and 2. Four is the sum and product of two with itself: $${\displaystyle 2+2=4=2\times 2}$$, the only non-zero number See more

Buddhism
• Four Noble Truths – Dukkha, Samudaya, Nirodha, Magga
• Four sights – observations which affected Prince Siddhartha deeply and made him realize the sufferings of all beings, and compelled him to begin his spiritual … See more

• Four Freedoms: four fundamental freedoms that Franklin D. Roosevelt declared ought to be enjoyed by everyone in the world: Freedom of Speech, Freedom of Religion, Freedom from Want, Freedom from Fear.
• Gang of Four: Popular name for … See more

• Four bits (half a byte) are sometimes called a nibble. See more

• A tetramer is an oligomer formed out of four sub-units.
In astronomy
• Four terrestrial (or rocky) planets in the Solar System: Mercury, Venus, Earth, and Mars.
• Four giant gas/ice planets in the See more

• The symbolic meanings of the number four are linked to those of the cross and the square. "Almost from prehistoric times, the number four was employed to signify what was solid, what could be touched and felt. Its relationship to the cross (four points) made it an … See more