i

letter

1. The ninth letter of the basic modern Latin alphabet.

letter

1. In the Turkish alphabet and its descendants, the lower-case form of dotted capital İ, which contrasts with ı as the lower-case form of dotless capital I.

symbol

1. The imaginary unit; a fixed square root of -1. Graphically, i is shown on the vertical (y-axis) plane.

   “a+bi with a is real part and b is imaginary part”

2. The unit vector in the x direction.

3. The current flow in an electric circuit, frequently measured in amperes.

   “v=ir (Ohm's Law)”

4. A common variable name representing a generic index, especially in loops.

numeral

1. cardinal number one

2. minor tonic triad

letter

1. The ninth letter of the English alphabet, called i and written in the Latin script.