Pi Day is an annual celebration of the mathematical constant π. See more

In mathematics, a square root of a number a is a number y such that y2 = a; in other words, a number y whose square (the result of multiplying the ... See more

In addition to being the 18th letter of the Greek alphabet, sigma also means 'sum' and 'deviation' in themathematics world. See more

The plus sign is written as a cross of horizontal and vertical lines: + The plus sign indicates addition operation of 2 numbers or expressions. See more

It is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spell... See more

The percent (per cent) sign (%) is the symbol used to indicate a percentage, a number or ratio as a fraction of 100. See more

The multiplication sign, also known as the times sign or the dimension sign is the symbol ×. See more

The equals sign or equality sign (=) is a mathematicalsymbol used to indicate equality. See more

In mathematics, an inequality is a relation that holds between two values when they are different. The notation a ≠ b means that a is not equal to b. See more

A minus sign is put between two numbers in order to show that the second numberis being subtracted from the first one. See more

An obelus is a symbol consisting of a short horizontal line with a dot above and below. See more