In mathematics , iota (i) is defined as the square root of -1 , i.e,i= √-1Iota is a greek letter which is widely used in mathematics to denote the imaginary part of a complex number.Let\’s say we have an equation: x^2 + 1 = 0 .In this case, the value of x will be the square root of -1, which is fundamentally not possible. To solve such equations which require the square root of any negetive number, the concept of complex numbers was introduced. Iota(i) is used to denote the square root of -1. Some people may also define iota as a number whose square is -1. Now we can write the square root of any negative number using iota. For example square root of -55 will be √(55)×i. Sometimes complex numbers are used to represent coordinates in two dimensions with the X-axis representing real numbers and Y-axis representing complex numbers. For example: the coordinates (3,4) can be written as a complex number as 3+4i . This might be the case in certain topics of physics.
Iota is a copmlex number. Which is represented by (i). The value of is (i=√-1)
Iota is a representation of complex no whose value is √-1

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I think you asked about ayotaIt is largest artery

√-1
In complex number chapter, the sign ” i ” stands for iota