Acts as a number punctuation mark (separating the real and the imaginary parts of a complex number); for example "ci ka'o re" means 3 + 2i. See also: kau'o, ka'o'ai, ka'o'ei.
imaginary i, comma - spherical coordinates: first coordinate gives magnitude (complex modulus/radius) of the number, the second number gives the angle from the positive real axis measured counterclockwise toward the 'positive' imaginary axis (default: in the primary branch/Arg) as measured in some units (which that number should contain; the contextless default will suppose radians); the angle is not normalized.