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The letter i represents the imaginary unit [square root of -1]. It's added after the number. So 5i means 5 units in the positive imaginary direction, or just 5 times sqrt(-1).

In electrical engineering, often the letter j is used, because i represents current in electrical notation.

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In electrical engineering, the operator 'j' is usually placed in front of a number, not behind it: i.e. (a+jb) not (a +bj).

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Q: What is the abbreviation of a imaginary number?
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