you know, IRQB, which is short for IRQ bar, which refers to IRQ with a bar over it, which means IRQ inverted, which is another way of saying IRQ active-low

or B for short

i hope you can see, then, how an active-low urgent interrupt could be NMIB, or not-maskable interrupt bar, or NOT-UN-IMPORTANT INTERRUPT NOT

(does some math, cancelling all the negatives) so it's the "everything is fine" signal, in so many words

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and then of course we get to IRQ, or Interrupt Re-Quest, a 2nd Quest for an interrupt, after the not-un-important not ok signal

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