The letter *i* is used to signify that a number is an imaginary number. It stand for the square root of negative one.
In electrical engineering it is often replaced by the letter *j* to avoid conflict with the symbol for current. See
Imaginary numbers.

- What are scalars?
- Real numbers
- Integers
- Natural Numbers
- Positive numbers
- Negative numbers
- The uses of negative numbers
- Scientific notation (normal form)
- Complex numbers
- Imaginary numbers

(C) 2011 Copyright Math Open Reference.

All rights reserved

All rights reserved