Question word to which the answer is a number
Infinity; when followed by a number, denotes a transfinite cardinal, such as ℵ0. As multiplication and exponentiation of transfinite ordinals is incompatible with that of cardinals, a new cmavo should be added for a transfinite ordinal, such as ω0.
i, imaginary unit. When followed by a real number, multiplies that number by i. If four real numbers are separated by three ka'o, the number is a quaternion, with the components in the order 1, i, j, k.
Pi (π), circumference divided by diameter
Null operand; inspecific number or placeholder digit