A bit field is an integer that is used to store a number of on/off flags (up to 32 flags per integer in NWScript). Each flag corresponds to a position in the binary (base 2) representation of an integer; the flag is considered "on" (or "set") if the binary digit (bit) in that position is a 1. Flags are often identified by the integer whose binary representation has just this designated digit being a 1.