Comment by vram22

Why the heck do people use 'bn' for billion and 'mm' for million? I've seen VC @fredwilson use 'mm' many times on his blog (avc.com), and IIRC I read some reasoning for it, either there or elsewhere, which made some kind of sense (they said Roman numeral for 1000 is M, so for million we use MM, though not sure if that is quite right logic), but why then the inconsistency between 'mm' and 'bn'?