On the other hand, I've never seen anyone use 10M to mean 10k, so there doesn't seem to be any actual confusion caused by this. 1000 = k 1000000 = either m or

On the other hand, I've never seen anyone use 10M to mean 10k, so there doesn't seem to be any actual confusion caused by this. 1000 = k 1000000 = either m or M or MM