Underflow

Underflow[] represents a number too small to represent explicitly on your computer system.

Examples

Cause an underflow:

10.^-1000
(* Underflow[] *)

Check for underflow:

MatchQ[Underflow[], Underflow[]]
(* True *)

Handle underflow in computations:

Quiet[Check[10.^-500, "Underflow detected"]]

Please visit the official Wolfram Language Reference for more details.