Imaginary Unit and Standard Complex Form The Imaginary Unit is defined as i =√-1The reason for the name "imaginary" numbers is that when these numbers were first proposed several hundred years ago, people could not "imagine" such a number.It is said that the term "imaginary" was coined by René Descartes in the seventeenth century and was meant to be a derogatory … [Read more...] about Imaginary Unit and Standard Complex Form