The expression "iπ" combines two important mathematical concepts: the imaginary unit i and the constant π. The imaginary unit i is defined as the square root of -1, which allows for the extension of real numbers into the complex number system. The constant π represents the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. In mathematics, "iπ" often appears in equations involving complex numbers, particularly in Euler's formula, which states that e^(iπ) + 1 = 0. This remarkable equation connects five fundamental mathematical constants: e, i, π, 1, and 0, showcasing the beauty and interconnectedness of different areas in mathematics.