Are there any rules regarding how to write model numbers or serial numbers in dialogue? For example, B1.

"B one."


Or "B-one."


It doesn't matter. Whether this is for fiction, or for something factual, it still doesn't matter. The only exception is that when people read it back they don't read something that isn't B1.

  • 1
    Yes. Outside regular spelling, there are no pronunciation rules. The final sentence above should be taken as The Rule: write it down so anybody reading it aloud would read it correctly. That's the sole purpose. – John Lawler Apr 13 '14 at 15:48

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