i (EN)

letter, symbol, numeral

letter “i”

1. the lowercase form of the letter "I"
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   In the word "imagine," the letter "i" appears twice.

symbol “i”

1. a symbol in mathematics representing the imaginary unit (square root of negative one)
   When you square i, you get -1.
2. a symbol used in engineering to denote the flow of electricity in a circuit
   To calculate the power dissipated in a resistor, you can use the formula P = i * R².
3. a symbol often used to represent an index in loops in mathematics and programming
   In the loop, "i" starts at 0 and increases by 1 until it reaches 10.
4. a symbol that stands for the annual effective interest rate in financial mathematics
   If the annual effective interest rate (i) is 5%, your savings will grow faster than if it were at 3%.
5. in music, a symbol indicating the minor tonic triad
   In the key of A minor, the i chord consists of the notes A, C, and E.

numeral “i”

1. the lowercase form of the Roman numeral for the number one
   You have to i. bring the food, ii. cook it.