(\pi) is a mathematical constant that represents the ratio of a circle's circumference to its diameter. It is an irrational number and is approximately equal to 3.14159.

(\infty) is a mathematical symbol that represents infinity. It is used to represent a quantity that is unbounded or limitless.

(\sqrt{}) is a mathematical symbol that represents the square root of a number. It is used to find the positive square root of a number.

(\sum) is a mathematical symbol that represents the summation of a series of numbers. It is used to add up a series of numbers.

(\int) is a mathematical symbol that represents the integral of a function. It is used to find the area under the curve of a function.

(\lim) is a mathematical symbol that represents the limit of a function. It is used to find the value that a function approaches as the input approaches a certain value.

(\log) is a mathematical symbol that represents the logarithm of a number. It is used to find the exponent to which a base number must be raised to produce a given number.

(\sin) is a mathematical symbol that represents the sine of an angle. It is used to find the ratio of the length of the opposite side to the length of the hypotenuse of a right triangle.

(\cos) is a mathematical symbol that represents the cosine of an angle. It is used to find the ratio of the length of the adjacent side to the length of the hypotenuse of a right triangle.

(\tan) is a mathematical symbol that represents the tangent of an angle. It is used to find the ratio of the length of the opposite side to the length of the adjacent side of a right triangle.

(\csc) is a mathematical symbol that represents the cosecant of an angle. It is used to find the ratio of the length of the hypotenuse to the length of the opposite side of a right triangle.

(\sec) is a mathematical symbol that represents the secant of an angle. It is used to find the ratio of the length of the hypotenuse to the length of the adjacent side of a right triangle.

(\cot) is a mathematical symbol that represents the cotangent of an angle. It is used to find the ratio of the length of the adjacent side to the length of the opposite side of a right triangle.

(\pm) is a mathematical symbol that represents plus or minus. It is used to indicate that a number can be either positive or negative.

(\because) is a mathematical symbol that represents therefore. It is used to indicate that one statement follows logically from another.