Ẹyọ tíkòsí

i in the complex or cartesian plane; real numbers fall on the horizontal axis, and imaginary numbers fall on the vertical axis

Ninu mathimatiki, ẹyọ tíkòsí (imaginary unit) n fun sistemu nomba gidi $\mathbb {R}$ laye lati fe de sistemu nomba sisoro $\mathbb {C}$ . O se ko sile pelu i tabi j tabi leta Greek iota.