Wow, you’re both wrong. Yes, “m” means meters. What do I know though, I’m only a professional scientist...
I had a feeling if we played dumb long enough that you'd succumb to vanity and tell us! :D
Big 'M' means Mega
Little 'm' means Milli, but it can also mean Meter
Little backwards 'µ' means micro
What could be confusing about that???