Three fields relating to signals are provided: sig_ignore, sig_queue, and sig_pending, representing, respectively, the signals that this process is ignoring, the signals that are enqueued on this process, and the signals that are pending. A signal is one of these “weird” things that has both a “process” and a “thread” facet — the fields mentioned here are for the “process” aspect.
Note also that the signals are stored in a sigset_t. QNX Neutrino implements the sigset_t as an array of two long integers; that's why I've shown them as a 16-digit hexadecimal number with a dash between the two 32-bit halves.