"S-O-S please, someone help me/It's not healthy for me to feel this." "So when you're near me darling/Can't you hear me, S.O.S?" Rihanna and ABBA have sung it. SZA even has a whole album named after ...

You've likely heard it hundreds of times over the years: SOS is the international call for help. While this is well-known, what isn't as understood is what the letters mean and why they're used ...