虚きょ数すう単たん位い

きょ

す

う

た

ん

い

Meanings

1

noun

imaginary unit

mathematics

Mathematical term for the square root of −1, denoted by i (or j in some engineering contexts).

void, emptiness, unpreparedness

数number, strength, fate

単simple, one, single

位rank, grade, throne

虚きょ数すう
虚数 is an imaginary number, while 虚数単位 is specifically the unit i (√−1).
複ふく素そ数すう
複素数 is a complex number (a + bi), which includes the imaginary unit as a component.

Compound of 虚数 (imaginary number) and 単位 (unit). The term is a direct translation of the English 'imaginary unit'.