I used K for thousand and M for million in emails for years. One day big boss asked me about them (While everybody used it, he asked me because he sure hated my guts). I explained K for kilo and M is for mega and they come from SI units.
I used K for thousand and M for million in emails for years. One day big boss asked me about them (While everybody used it, he asked me because he sure hated my guts). I explained K for kilo and M is for mega and they come from SI units.