Expression evaluating to -1.#IND ?

I am performing following calc, where result if declared as double

result = (a - b) / b

Now

(1-0)/0 results in 1.#INF, which i can check using Double.IsInfinity method,

but (0-0)/0 results in -1.#IND, what does IND means, how can i check for expr evaluating to -1.#IND there is no Double.IsIND method.

Please help. Thanks