Be assured that the floating point value is +Infinity
if the numerator of a floating point division by zero is positive, -Infinity
if the numerator of a floating point division by zero is negative, and NaN
if the numerator and denominator of a floating point division are both zero. That’s in the IEEE754 floating point specification, which is what C# uses.
In your case, the console is converting the infinity symbol (which is sometimes represented typographically as a horizontal 8 — ∞) to a vertical 8.