letter The ninth letter of the basic modern Latin alphabet.
letter 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 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
symbol The unit vector in the x direction.
symbol The current flow in an electric circuit, frequently measured in amperes.
v=ir (Ohm's Law)
symbol A common variable name representing a generic index, especially in loops.